Doctor, I Am Suffering From Inconsistent Stool With No Abdominal

Doctor, I am suffering from inconsistent stool with no abdominal pain for more than a year. Sometimes I get perfect poop like that of banana as described in bristle stool chart and sometimes on the loose side. I don't suffer from chronic constipation and have daily bowel movements with feeling of satisfaction and maintain balance most of the time i.e. output of stool is equal to input (food) I eat. I suffer from gas (comes out of anus) and rumbling of intestines if I don't get complete bowel movement for more than 2 days.

I don't have any chronic food allergy either albeit I have some issues with digesting milk but that is eliminated if drink warm milk boiled for 10 minutes with herbs like ginger and cinnamon. I can digest rest of the dairy products. I have no problem with grains. I also don't eat processed foods and drinks of any kind and stick to only natural foods with least processing.

I take only two supplements in my diet, triphala (5gm at night) to keep gut healthy and isabgol (in the morning) to maintain bulk of the stool. If I stop taking them I don't get complete bowel movement. I just take them as a precautionary measure to hedge my risk.

Apart from this I am not suffering from any other common digestive disorders such as acid reflux, acidity, distension of belly, diarrhea, indigestion etc.
I had non-bleeding piles for the first time since my childhood last year due to slight tight stool. It was cured in 30 days.
My history of diseases-During my childhood days right after my birth, I had weak digestive system as diagnosed by doctors at that time. Constipation and blood in stool was common for first five years. As I grew up these problems went away for next five years. When I crossed the age of 10, I started to get dull abdominal pain and continued for more than year till I was cured. Then during my teen years from 14-16 I started to suffer from constipation with weak but daily bowel movements. As time passed, it started to become chronic and I had had no bowel movement for more than 5-6 days and I had to resort to strong stimulant laxatives to expel stools. Thank god that with regular exercises and switching to natural foods I have had not this kind of constipation since then. May be I have congenital disease as my mother tells me that due to financial crunch she couldn’t eat recommended balanced diet.

My daily diet and work schedule- I follow a disciplined life with waking up and sleeping at fixed time with tolerance of one hour. I sleep for 6:30 hours a day. I eat three times a day with a gap of 4 hrs. I try to eat balanced diet-1 bowl (200gm) each of of complex carbohydrates porridge, yoghurt, fruits, vegetables and proteins (from veg source only). Porridge and yoghurt in the morning, fruits in the noon and salads, vegetables and proteins at night. I daily do Yoga and brisk walk in the morning. My work involves sitting for long time since I am working in banking sector and have high stress (also prep for professional exam GMAT) all the time. but I try to offset my sedentary work life with natural foods and exercises. I maintain food diary daily and have eliminated some common food which triggers my problem.

My blood test and other reports-My complete RBC test is normal, inflammation is well below normal-C reactive test, no bacterial infection in the stool and urine composition is normal too. I haven’t had endoscopy yet.

My age is 25 yrs and unmarried, weight 72 kg and height 6ft and on the thinner side. I have some bearable low back pain intermittently.

Despite all my efforts to live as much as healthy both mentally and physically, I still don’t understand what the problem is and what the source is. It frustrates me and wonders why I have all this issues and people are eating wrong foods, indiscipline life and still are fine at least with respect to digestive system.

I hope that some doctors will able to tell me where I am wrong and what could be the reason behind it. Waiting with patience.
Regards