Your symptoms are not normal and this method may not be suiting you.
20 ml coconut oil daily can definitely cause diarrhea, acidity, nausea and right-sided abdominal pain, especially if you have a history of gallbladder issues.
Unexplained body itching + right side pain should not be ignored — please stop the coconut oil and supplements for now.
I would advise:
Stop coconut oil immediately
Stop unnecessary supplements
Start simple, light diet
Get
LFT and ultrasound abdomen if symptoms persist
If pain, itching or nausea worsens, consult a physician directly.