Hi, thanks for posting your concern in the HCM.
I think the pressure in your chest and back are symptoms of bloating. This may be due to 
peptic ulcer disease or non ulcer dyspepsia, or some intestinal or 
gall bladder or liver pathology. 
History regarding your bowel habits, is very important in this regard. 
1. Do you have irregular bowel habits? If yes, is it predominantly 
constipation or diarrhea?
2. Have you ever had blood in your stool or colitis?
3. Are you having nausea and/or vomiting?
4. Do you have abdominal pain?
5. Do you have any known comorbitt
You also need to have the following tests done-
Complete blood count, urea, creatinine, electrolytes, fasting TSH, LFT, amylase and lipase.
USG of whole abdomen
For the time being I would suggest you to have low fat diet, avoid spices, alcohol and carbonated beverages.
I also recommend my patients to have Simethicone 60 mg tablet 3-4 times daily after meals and at bedtime for 7 days,
and 
Enterogermina oral suspension twice daily for two weeks.
Please also consult your local gastroenterologist for further evaluation.
For any further questions,please write back to me.
Regards,
Dr. Kaushik