Weak digestion, bloating/gas problem.

Hi, I m 28year,5,2"50kg. I have irregular bowel movement and Gas problem from past 5 years.from past 5yrs,m taking good diet,i exercise, less junk foods. In morning, stomach is not cleared in 1st attempt,I have to go 2nd time within 30-60mins,and after  breakfast,I need to go within 15mins.I feel something below navel like stool is still there. Now,after 2pm lunch,I start feeling gas ,and around 3pm-4pm,i need to go toilet. but this time also,i dont feel like bowel is cleared.around 6-7 pm i again have to go for toilet. Now,after 9pm dinner,i again feel like going to toilet,but nothing comes out.its all gas inside.all i do is fart from evening to till night.i can feel my stomach bloated for whole day. And,bloating and gas is maximum at night. It takes me 5-10mins in toilet, for every sitting. sometime My bowel is smelly, mashed up,wet,sometime mucus(white/jelly like) at end.i try doctor but no help. all they give anta-acid but that is not a solution.please suggest.