Stool 2-3 times a day. Something other?

This problem has been with me for long on and off . Having stool 2-3 times a day . I "don't go" to toilets immediately after meals . After eating if i sit improperly or lay down then i can feel i am gonna go toilet later on . And the stools are proper not liquid but scanty sometimes ( i am prone to mild constipation ) Some yoga asans do help in this problem of mine . Appetite is medium not happy with it . My weight has stabilized near 50 not gaining nor losing . Ayurvedic doctor see it a problem of naval displacement . Want to know if its a large bowel infection or ibs/sibo or something other ? Because physical things do affect my problem( and strangely one of them is masturbation , sounds stupid but it escalates the problem for a day or two ) A gastroenterologist gave some antibiotics , they did help a little but my stomach didn't feel good . Stopping milk didn't work