I had an operation on my thyroid about fifteen years ago and I felt fine. Then about about eight years ago I was put on lithium (long story) but within two months I had put on three stone in weight, my hair began falling out,my nails became brittle, i developed IBS, got acid reflux.muscle pain etc. After nine months I came off it but was left with all of the above symptoms. I know lithium can effect your thyroid but was told that my problems were all due to stress. Recently the symptoms have become much worse and my doctor has arranged to do blood tests. Could anybody please tell the best time of the day to get the tests done and is it better to fast or eat something..