I went through everything. Ducolax or Dulcoease didn't do a thing for me. I started taking sennacot and got upto taking 15 all in one go in desperation. Docs suggested I took 2-3 per day but that did nothing. I was also on miralax (UK version, can't remember the name) but didn't really do anything either and like you alibee just made me feel sick.
I then was put on Prucalopride/Resolor - only just registered in the UK - which is meant to stimulate the colon. That took the edge off a tiny bit but mostly just felt sick and had headaches. Still didn't really do enough and started doing a dose of Picolax (don't know what the US equivalent is) but the stuff you take before a colonoscopy to clear you out completely - like the most powerful laxative in the world. That would do the trick, but was utterly disgusting and wiped me out for a day or so - not to mention the 5 hours spent on the loo as it all gushed out. I got to the point of having to do that once or twice a week. I never did enemas though.
Then I finally decided enough was enough. No way to live in my opinion and got my ileo. I took great pleasure in chucking it all in the bin when I got home from hospital