What Causes Persistent Mucus In Stool?

Question: Getting white colour milky liquid sometimes in stools which floats on the surface from past 1 year . Have done endoscopy , ultrasound , CBC , C reactive protein , celiac disease test ,thyroid , ,ecg , echo ,tmt , stool routine , stool occult blood test , urine test etc .. but no significant findings in them . I have consulted , General physician and two Gastroenterologist , , from one opinion they said to not to worry could be IBS , other opinion is to go for colonoscopy . I have no pain in stomach , no rectal bleeding , no major change in bowel habit . Just I need to go to washroom 2 or 3 times in a day which is there from past 10 years .

I am 29 years old , 6 feet height and 52 kg weight , not able to gain weight since 5 years . sometimes I feel dizzy with palpitations which feels like fainting for some duration and then everything goes well for couple of days and then it starts again , not sure what is going wrong .

Problem of Acidity & Gas from past 10 years and this problem runs in my complete family .

hi , As requested PFA the requested image . sometimes lot if undigested food is also there like tomato or green leafy vegetables.

thanks sir ,.will take these medications . last query with the tests done so far is it safe to rule out any major disease with bowel like colitis or Cancer etc..