My dr. suggested lying in a very warm shallow bath to help relax. If needed, you can go right there and then wash up. But i found I could lie there, then towel off and get right on the toilet. Then I'd hop back in and wash to prevent butt burn. Time consuming, but it worked.
Even after 1+ years I find I have to stand up in the middle, and move around a bit, then empty again. I also drink a hot beverage first thing in the AM.
I find I am better off without thickeners as I empty better when output is looser. The only time I take immodium is when I'm having a really watery episode that does not want to stop. Fortunately I have quite good continence, so I do not leak. You can do Kegels to help with sphincter strength.
Eventually you will get the hang of emptying, it takes a while and is gradual. My dr. said give it a full year, and that was true for me.