if the tests you mentioned above were all normal then i agree with the doctor it could be just stress
related and anxiety
you have already been prescribed medications to reduce the symptoms that you are feeling but on a small note you should be careful on the side effects of these drugs with the anti tbs you are on, you should be going regularly doing test on the liver
to avoid its toxicity
i would also suggest you see a counseller to help in telling you ways in coping with your stress
hope have answered your query
get well soon and all the best. be strong.