Is there a link between constant fatigue and serotonin levels?

This week I'm getting my tonsils and adenoids taken out. I've never had surgery before and I don't know what to expect. Can you explain please?!?

After having anal sex with my partner, I noticed blood on him, although there was no sign of external damage. The next day I am feeling pain internally, but I can't pinpoint its location. What are the possible dangers and should I see a doctor?

1) Over the span of the last couple of years, I have noticed a significant number of moles appearing on my body. They have been appearing everywhere from my neck to my inner thighs. I had one on my neck since childhood, but now have so many more. Is this normal? Is it something I should be concerned with? And does child bearing have any relevance to this happening?

2) I have a mole which has turned very dark purple, and grown a bit in size (still small). This is the second time it has done this — last time was a couple of weeks ago, and it slowly faded back to almost nothing until today. Should I be very concerned about this?

I'm really stressed out because I've been getting recurring urinary tract infections coupled with yeast infections for the last six months. I'm not sexually active and I've been to two urologists and a gynecologist — they've all given me medication but the problems always turn up again. Is one problem causing the other? Can these prolonged problems be doing serious damage to my body? Perhaps you can't answer my questions either, but I'm really at my wit's end. What do I do? I'm tired of doctors and embarrassing exams and I can't understand why this is happening if I'm not having sex. Also, I'm a senior and in five weeks I'm out of health insurance — extending my parent's policy is very expensive and not an option. I'm busy trying to set up interviews, finish a thesis, and do a million things — I don't have time to be running around to more doctors' appointments! What insurance options are there for recent graduates?

I am wondering what is the difference between a steam room and the sauna, is one better than the other? My gym has both and I am interested in trying them out.