Hello! Thank you for the query. Your symptoms sounds like hypothyroidism. Weight gaining, bloating and constipation, cold feeling are very characteristic for this condition. You may also suffer from weakness, sleepiness, dry skin, hair falling. Other reasons of bloated stomach are bad diet (low fiber intake, low mineral water intake), chronic bacterial infection, aerophagia (swallowing the air due to loose dentures, drinking carbonated drinks, chewing gum, fast eating), IBS, pregnancy. I suggest you to have thyroid tests. pregnancy test (if pregnancy seems possible) and if negative, try with diet change. Increase fiber rich products, mineral water intake and add probiotic. If no relief in a few days, you should visit gastroenterologist, have physical examination, stool tests and consider further diagnostics. Sometimes relief from such symptoms gives Rifaximine treatment (should be prescribed by your doctor). Hope this will help. Regards.