Hello. I have been on lithium since December but only increased my dose over the last month or so. I have been on 1,200 mg for two weeks. My level last Friday was 1.02. My doctor told me to be very weary of toxicity symptoms. I feel fine but I had diarrhea once today. My heart was racing a bit, but I am assuming it's anxiety? Should I be concerned? Call my doctor? I don't want to panic over nothing.