My brain is going to explode!

WM
Ok ladies, I need advice. 
I recently had my wisdom teeth removed and the antibiotics I was given gave me a yeast infection. I havnt had one in 13 years, no biggie, I'll just grab some Monistat and be done with it, or so I thought.
Fast forward 3 days and I think my skull is going to collapse in on itself. I can handle the itching, burning and cramps, but the nausea and headaches are killing me. 
Is it normal for it to make me feel so horrible? The yeast infection is nothing compared to what the medication is doing to me. I don't know if I should stop using it and just let my body deal with it on its own, or suffer through it and finish off the last 4 applications. I feel like shit. 
Anyone else been through this? Or am I having a bad reaction to the Monistat? Also, will I be worse off if I just stop taking it?