Constipation. Very bad. please help me.

Hi my age is 29 years. I have been suffering from constipation since 2 years. I consulted every doctor in Hyderabad to diagnose my problem. They did everything - sigmoidoscopy, colonoscopy, balloon manometry test , testosterone test , and everything is normal. I used every kind of laxative and medication out in market but my condition is not improved. My lifestyle is well arranged - I don’t have any habit of drinking or smoking. I eat clean food with good amount of fibre and no junk food also. I exercise every day. Still I suffer despite being like this. I need help. It is affecting my day to day things. I spend more than 2 hrs in bathroom still my bowel doesn’t empty. I push hard to empty my stomach, still it is incomplete. I am forced to live with it and it is very inconvenient. No medication is working. I am feeling very bad. Please help me.