Paranoid about swollen glands...medical advice?

I have had swollen lymph glands in my neck for about a month now, and swollen tonsils. I have been to the doctor and been tested for glandular fever, the results of which I should get in about a week. However, surely if its glandular fever I would know by now? She also put me on a course of penicillin in case of a bacterial infection, but it's day 4 and still no change. I have a mild sore throat that comes and goes but its only light. Basically I have been a smoker for about 6 years, and while I have now quit, it's only been recently and I smoked up to 10 a day - now I'm incredibly paranoid I Have some kind of oral cancer even though I'm only 22. Can anybody shed some light on what might be the issue? I'm getting worried :(