Matthew, you really should tell your mom or dad about what's happening, and ask them to take you to the doctor. Only good things can happen from doing so. Either you'll find out that it's not big deal, or your doctor will discover what's going on and find a solution. Please do it right away.
Well Matt you sound mature for 12 years old. About your breathing problems. Being a young man I would think that maybe a parent, family member, teacher or doctor should be advised of your particular problem. Are you keeping this a secret? You found your way here so I hope you can find your way to letting someone know of this problem. Seek help that's close by you. Do you see a doctor regularly? Are you on any other medications? Keep posting and let us know how your getting help.....ike