Talk to Gastroenterologist on Abdominal Pain

From the last 3-4 months i feel pain in lower abdominal area after having any type of meal. Boojh sa mehsoos hota hai, Aur lagta hai k stool aaya hua hai but kabhi stool aa jata hai, kabhi nahi. Agar aa jae to me relax go jata hoon. Otherwise, ye boojh sa mehsoos hota rehta hai. Shuro me Mucus bhi aata tha aur gas bohat release out hoti thi but ab medication se wo improve hua hai but ye boojh aur kabhi sath constipation wali feeling aur kabhi diarrhea wala masla chal raha hai consistently khaana khaanay k foran baad. I've used Levopraid 25mg, Secnidal Forte, Novidat, Risek and Rifaxa forte earlier as per recommendation of my physician but I'm not still fine. What could be the reason and what should i do? Both Ultrasound and Lab reports are OK.