Argh; I still have mine. I had mononucleosis when I was about 18, and they swelled up so bad that I had to stay at the hospital and be fed through an IV! I do get tonsilitis every so often now, and the breathing thing is something I am familiar with; it took me awhile to figure out that was what it was caused by (the tonsils.)
I would get to a doctor; I am pretty sure that antibiotics could help.