Can I stick a hot dog in me?

What causes a yeast infection and how can I prevent one?

I just got over a yeast infection, or at least I think its over. I have tried to have sex with my boyfriend twice. Well, it hasn't worked out. When he goes inside me it hurts, and so we stop and we don't go on. Is this normal? It has only been a couple days since I used the yeast infection medicine, and I thought I was clear of infection. How long will this last?

I take oral contraception, no biggie there. I was recently put on amoxicillin by my doctor for a sinus infection. I think I developed a yeast infection as a result. I had one before way back when, so I knew what the symptoms were. At any rate, I bought one of those over the counter 3-day cure kits. However, I forgot that the goo was supposed to be inserted at night and I instead put it in during the day (triggered mostly by the fact that I started using the kit as soon as I got it home and repeated the dose at the same time each day). It's three days later and it still itches a bit down there. Did I totally botch the goo? Should I try again?

Additionally, my fiance comes home from six months of overseas military duty on Friday. I'd like to be able to sleep with him then (hence why I'm trying to get this all cleared up), but we use condoms as one method of birth control and I've heard that these over the counter yeast infection cures decrease their effectiveness and cause them to break. What can I do?