Hello all, I'm back on Lithium after being off for two years. I had foolishly convinced myself that nothing was wrong (yet again), but after a recent meltdown in an airport, I'm agreeing to be medicated again. I started Lithium two days ago, and today I have this really awful headache. It doesn't feel like a migraine. It's located in a different area if that makes sense. I don't remember if this is a side effect, and my doctor didn't go over anything since it's not really a new med. I'm only taking 300mg at bed time right now for 7 days, then going up to 600mg. I also have very bad anxiety, so I don't want to blow this out of proportion and call my doctor. I just wanted to know if this was a normal side effect, or if I should call. Thank you!