Severe constipation in pregnancy

Sharron • Shift worker, newly married
Ok so I have longstanding history of constipation, have had bowel obstruction and partial obstructions, and been hospitalized. 
Since I started constella I've been way better but on and off I'm still constipated, anyway, I've been drinking lots and eating lots of foliage and fibre and I haven't gone much at all since I can't remember when and I'm starting to get very uncomfortable........
Colace senekot and enemas do nothing for me :(