Talk to Gastroenterologist on Intestine Poor Absorption & Mild Diarrhea & Abdominal Pain & Muscle Pain & Joints Pain & Weakness

i am suffering from poor gut health and poor digestion from past many years (probably 10-12 years) I have diarrhea (Poor absorption) , i need to go toilet multiple times , if i don't take Psyllium husk then diarrhea gets stuck and causes severe abdominal pain, if i take husk then pain is still there but not severe, too much weakness and pain in the joints & muscles if i don't take multi-vitamins. i have done medication course from many doctors which gives a relief temporary and problem remains the same. even though i take very selective non-spicy , non-oily, non-fried diet can you please help me out in diagnosis ? i can visit you in person if you ask me, just give me what tests i should bring the reports , For your information i have already done general tests 7,8 months before like CBC , LFT, AST, Stool, Urine , that all were clear , please guide,

jazakAllahu khair