Digestion and Urination problem. Me!

It's been a month since my symptoms like Gas/acidity in stomach and frequent urination with burning sensation after urination started. I sought consultation here from a Urologist he gave me medicines for UTI like Niftas, Pan D,Mirabig25,alfoo for 5 to 7 days & Ston1 b6 for 14 days. As per his prescription I did tests r/m and culture sensitivity of urine & reports came as normal.I let him know and completed my medicines course as he said.My frequent urination and persistent burning sensation reduced to a large extent after a week. Although reduced I still have burning sensation in my Urinary tract especially anterior of penis after I pee after Lunch & dinner or if I don't drink water continuously.I drink nearly 5 litres of water every day. Also I still have the stomach problems & my stool is soft with more water content than normal.I can't eat food in normal quantity as I used to do before. I don't know what should I do now. Also I can't see a doctor here due to Covid situation.Help me!