I haven't finished taking the medicine yet because I'm only on da...

I haven't finished taking the medicine yet because I'm only on day 4, but I must say that it's clearing up the staph in my right armpit. My left armpit is still swollen and hurts like hell. My mother is an RN, and she's been trying to drain the pus and blood from the wound. It hurts so bad that I'm ready to just drive up to the local ER and have them lance it. How long does it usually take for Bactrim to clear up the infection? I'm taking 2 pills once a day for 10 days. And another thing, I think why people are having nasty side effects to the medicine is because it's not mixing well with their body chemistry. My sister took Bactrim last year for MRSA, and she cleared up beautifully without any horrible side effects. Thanks guys!