Hi Purdylady! I too suffer with with IBS predominant C with alternating D. I was prescribed anti-depressants and anti-anxiety drugs nearly 20 years ago for the "stress" which all the doctors at that time believed to be the primary cause of IBS. I found the anti-anxiety meds very helpful until I started taking them by the hands-full. The problem with those drugs is you begin to quickly develop a tolerance for them and need to take more and more for them to work. My only suggestion would be to try to avoid taking them except in really extreme situations. It could be that your exhaustion is partly due to this drug (and the bentyl which can tire you out). They are quite good at making a person feel very wiped out.
Because of my C, anti-spasmotics only made my gut worse. I had the same experience with probiotics. Everyone responds differenly, of course, but the bentyl and drugs of that type pretty much shut down all peristalsis in my tummy, hence rendering me constipated.
I use a product from a clinic I go to for hydrocolon therapy. It's a blend of chinese herbs and it is the only thing I've found that consistently works for me. Here is a link to the product if you are interested.
I can't believe I am going to say this, BUT it sometimes help to force yourself to get up and get moving. There are some days where that is absolutely impossible for me (like when I am running with D to the loo every 10 minutes or bound so bad that I can't sit down) so I completely understand about wanting to just lay on the couch. But I also know that for me, if I get into this habit, it leads to a sense of depression and hopelessness which does my gut no good either. Often, if I manage to get through some daily activity in spite of the pain, at least emotionally I feel better.
Hope that helps!