I was put on 20mg Prozac months ago and had an almost immediate adverse reaction. I stopped after 6 doses because I landed in the ER. They said it wasn't dangerous but I was probably one of those people who just can't metabolize Prozac, so it was giving me insane side effects. I've tried Metoprolol, that was months ago too. Took a single dose, and had a very odd reaction. Shaking, nausea, fast heart rate, couldn't sleep. Doctor stopped it immediately and months later I'm on Propranolol. It's much more tolerable, however I do experience some shakiness and issues sleeping on it. It has gotten better the more I've taken it. Do you have anxiety towards new medications? Both Prozac and Propranolol can have strange effects where they increase anxiety for some people, but those things should resolve with time. Best bet would be to ask your doctor!