Hi, Crook32 , I have tiredness almost all the time, but mostly because I'm not getting enough sleep. Probably your doctor checked your thyroid, because that can cause tiredness. One thing I thought I'd mention is that too much coffee can take a turnaround & instead of giving you that familiar pickup, it can cause tiredness. Too much of a good thing, as the saying goes. Also, have you considered seeing a nutritionist? Primary doctors don't usually have a lot of knowledge about nutrition. Good luck with this. I hope you find the answer.