Tightness and soreness in my low throat.

I feel tightness, soreness and heaviness in my lower throat and chest as well as suffocation with shortness of breath. In the morning I don't get any such symptoms this starts only in the second half of the day. I did my PFT, CHEST PA XRAY AND ECG and all my reports have come. Normal. My pulmonary doctor told me it may be due to acid reflux or anxiety and for this consult a physician or gastroenterologist. And so my family doctor prescribed me medicine for anxiety to start with but I feel suffocating after I take that tablet. So I was told to take it only for a week and stop it . I need some advice and medicine to stop this. Please help it's really urgent I have been trying different medicines but don't get  permanent relief.