Thank you for your query.
Crohn's disease is diagnosed by a biopsy, so if your colonoscopy
is normal, chances of having Crohn's are very less.
The breathless ness and edema is due to your hypertension
Moreover, if all tests are normal, your chronic diarrhoea could be induced by the various drugs you are taking, and also due to pregnancy
You need to consult an expert Gastroenterologist again.
Also, try psychiatric counselling
and behavioural therapy for your depression
Investigate yourself for calcium and vitamin D deficiency for your aching joints
You seem to have multiple problems , which could very well be psychosomatic.
Try regular exercise, diet modifications and yoga.