I am about to try Prozac again. I have the tablets and will take my first dose in a few days time. I was given 20mg of Prozac in my first severe year of ME fifteen years ago and it was a horrible experience. It felt like I had been given a lead coat to wear. It was physically crushing. It was too high a dose for how very ill I was at the time. I want to try it again but at a very tiny dose for the reason that I want to see if it helps calm down my CNS. I read somewhere that Prozac has a long half life, what does that mean? Should I not take it everyday incase it causes problems.