I understand how you feel! Sometimes you feel so horrible and hopeless, you want to resort to drastic measures. Please know you're not alone and we'll help you get through this difficult period.
Could the Citrucel be causing you problems now? Are you using the orange or clear mix? I tried the orange mix years ago, after having a difficult time with Metamucil; unfortunately, the Citrucel wasn't any better. Two ingredients in Citrucel orange, citric acid and potassium citrate (which is also in the clear mix), can actually cause diarrhea. I would say that, along with the PPI, could be keeping you from becoming stable.
And how about stress? I think one of my biggest non-food triggers is anxiety and stress. Is anxiety a problem for you too? Are you doing anything to manage the stress?
Like Linz, I also had to cut out IF completely when I was first stabilizing in addition to taking Immodium as a preventative. I'm able to tolerate Benefiber (guar gum) and inulin (found in my Luna bars!) as my SFS. Another thing I did was try to keep my eating habits and sleeping habits on schedule and I tried not to stop eating at least two hours before bedtime; although this didn't stop the D, I started to go to the bathroom at regular times, usually in the morning. This might help you from having attacks during the night.
Well, I hope this helps and that you start feeling better soon!