did the doctors just check to see if there was an infection. You may need to ask if you could have a imbalance of some sort. Could be hormonal imbalance or a vitamine dificiency.
I think there is more than 1 thing going on with you, some symptoms point towards anxiety and the others to what I said above.
Get the anxiety treated first then you can figure out what the other problem is.
I would also look at your environment too, do you live alone? if not are there other people with similar complaints?
Check for tiny gas leaks (carbon manoxide causes some of the symptoms), check the water supply (no dead birds or rats in your cold water storage tank).