Does acid (LSD) have a detrimental affect on women who use the birth control pill? Is it possible for a woman to be impregnated by pre-ejaculatory fluids four days after the menstrual cycle after unprotected sex?

I have a history of "experimentation" (infrequent or occasional use of ecstasy, 'shrooms, and other drugs — mostly prescription pills). I am completely sober now, but am worried about long-term damage to my brain. I used drugs infrequently (no more than three to five times for each substance), but drank regularly. How worried should I be? Is there anything I can do to combat long-term effects?

Recently, I have heard about a new hallucinogen available called salvia dinorium. Some of my friends have tried it and they tell me it is an incredible experience and that when you hallucinate, you have the perception of being brought back in time. Before I even think about trying this, however, I would like to have a more precise idea of what the effects are and what the possible risks of taking salvia are.

I have been reading some studies that state a correlation between the "religious experience" generated by the psilocybin in magic mushrooms and LSD, and an alleviation of body dysmorphic, obsessive compulsive, and other related disorders. I was wondering if this is anything being pursued, whether these effects have been proven, and how long the symptoms are alleviated for if this is the case. Are there any specific conditions that must be met in order to avoid a "bad trip"? I know people experiencing any kind of mood disorder are succeptable as such.