On the basis of your symptom it is indicate that these are symptom of gastro intestinal tract inflammation from stomach to intestine and it can be due to many factors like bad lifestyle, not drinking enough water and some constipation.
It can due to stress as you have said you have anxiety disorder .
I think that for correct diagnosis and right treatment there is need of complete history so you should take consultation from a good doctor.
Next Steps
you should change your life style like take balanced diet and do some aerobics exercise with yoga invitation.
Health Tips
you should drink enough water per day.
don't take outside spicy and fatty food.