As Pop Rivet suggested, I would go for whatever education you can while enlisted. It can't hurt. I don't know what options are available to you as I have never been in the military, but more legit education (ie, not internet diploma factories) can never hurt as long as ridiculous student loans are not involved.
Even though math isn't your strong suit, try to get some math in. Good paying jobs involve math. I avoided engineering in college because "too much math." I sincerely regret that. It isn't a strong suit for me either. It doesn't come naturally to everyone, but you need it for good technical jobs. Plus, it's a life skill that will benefit you no matter what. As much as I hated math and still do not enjoy it, I regret not trying harder at it and going for more advanced math courses than the bare minimum ones I needed to get my degree. I really screwed myself by avoiding it. I had to take out my phone today to figure out how many cans of $0.50 off Grizzy Wintergreen I could get for my boss with the $20 he gave me...granted, the store clerks guessed way wrong too. It was a sad, embarrassing scene. No wonder eastern countries are kicking our [censored] at this stuff. Calculators, in particular TI-83s, or whatever American kids use these days (phones?), need to be out of high schools and most or all college classes.
I nailed history, and accidentally ended up with a minor in American studies in college because I took so many history courses for the [censored] of it (my major was marketing/business administration - get drunk and skip class degree), but I can't do anything I enjoy with that, or at least haven't "found my way." Turns out, I don't like my major at all, I just found something that was easy to pass and didn't interfere with my partying. Now I am a college grad selling car parts...not that I hate my job, I actually like it, but I could probably be doing something I like at a higher pay scale had I taken school seriously. Now I am just a "wage slave" as some here call it, though at least I like what I do and have fun with it. And I take pride that some level of BITOG obsessiveness is present in my store...G-05? Got it. Pentofrost? Got it. Any OEM or quality aftermarket part you want? Can get it if we don't got it. Oil? Ha, what do you want? We even have Autotrac II and genuine Mercon SP and LV. Relatively awesome place to work, but too bad my pay still sucks. I could have done more by now and made a lot more money if I had really tried rather than said "just give me a freakin' degree that doesn't eat up my free time."
Emergency services may not be a bad idea. Some risk involved, but not more than you have already experienced. Government jobs tend to have good benefits, good pay, and reasonable life demands. Not that they are all easy, but the public sector can be much worse. If you don't need an adrenaline rush out of your job, maybe USPS? Don't laugh, it's a good deal for the full timers.
The problem with a lot of trades jobs is that while they can pay well, they have a tendency to chew you up and spit you out. Benefits may be minimal. The job may have long/odd hours and be hard on your body. I know some HVAC guys who are happy overall because of the pay, but always tell me the job kicks their [censored]. Most mechanics I know, and I know a lot of mechanics, are perpetually frustrated, mad, and hate everybody. Some seem to have found their niche and somehow stay positive and like what they do, but you have to be in the right shop, or your own shop. All the happy mechanics I know work for well respected indy shops specializing in high end cars or commercial vehicles, and they set the rules, not the customer. Their customers are fine with just leaving the vehicle for however long it takes and writing checks like it's nothing. Working for chains and dealers tends to be more stressful, sometimes way more stressful, but you have to cut your teeth somewhere. The really good indy shops won't just say "oh, you went to UTI? Great, you're hired!" They laugh at people fresh out of UTI. One of the British shops here has a mechanic from Britain...now in freaking Alabama...he refers to me as "matey." I don't know how he deals with this place, and if it wasn't for all the broken Land/Range Rovers he probably wouldn't.
I'm not saying this is your expectation, but a lot of people these days think "if I just get a degree in anything, I can do good in whatever." Nope. Find what you like and focus on it. Really focus on it. And take whatever classes you need to succeed, even if you don't like or excel at all of them at first. The competition, especially from overseas, is fierce and hungrier than we are. The easy pension jobs from previous generations are mostly gone, and people who think a quick and easy degree will get them ahead are getting taken. Find what you really want to do and go for it sincerely. Do not [censored] around. I had a lot of fun [censored] around, but it put me behind.