I've been suffering for years (daily) with lightheadedness, nausea & head pressure/slight headache. My doctor has now put me on Prozac (20mg) every morning. We are not sure that we are dealing with headaches but if not, I expect the Prozac won't work and we will look for another cause. I've had a terrible 4 days on the Prozac... my normal symptoms but much worse. I feel a bit better today so hopefully we are on the right track and the Prozac is kicking in. Anyone had this problem?