You're not necessarily on it for life. Sometimes people go on medications temporarily to help them through something. If you think you have PTSD, you might want to check out the EXCELLENT PTSD board here on Sober Recovery. Many folks over there have experienced similar things. Anti-depressants usually take a few weeks to work, so hang in there! It also sometimes takes a few tries to get medications that will work for you. I have bi-polar and perhaps some PTSD, so I have mostly been there. Take care!