Check with your doctor next time you're in and see if he has anything to offer. You definitely want to keep trying, but keep in mind that while what you describe is NOT good, and should be corrected, I was having periods of over 60 seconds of no breathing. There are a lot of factors that play into this, but one of the major dangers is when you stop long enough that your blood O2 saturation level drops significantly. Ten to 15 seconds of breath holding probably won't do that (but keep in mind, I'm not a doctor, of course).