Excessive yawning, fatigue. Damage!

Sir/mam, I am 30 year Male obese, having a big stomach, i am having excessive yawning from evening to till o sleep,i am maintaining my bp with metoporol xr 25 and Telmisartan 20mg,my Bp in the morning 120/70 and night 110/70 I have left upper back pain, when I use hot water bag it will go,but constantly i am having back weakness,o am not diabetic, i am having a lot of anxiety,fear of illness,i consulted psychiatrist, physician, cardiologist, pmr , neurologist,everyone said that i have to lose weight,ok i understood that,but when this fatigue and yawning comes excessive burps will come,that also involuntary, i am using alprazolam to get sleep, alprazolam.125mg per day,o will work a lot in the day, what is this,my hb%12.5, cholesterols 172,so please tell me what is my problem, when a small pain came to left chest, o am freaking,i smoke 2 cigarette per day not more than that, drinks occasionally, is this any vagus nerve damage