sorry to hear about your frustrations. i can relate 100 fold. i'm just curious, do you eat dairy? if so, i would try eliminating dairy from your diet since it is a major trigger of IBS-C.
you should try different fiber supplements, drink tons of water, eat prunes, walnuts, pumpkin seeds, and take magnesium supplements. you should also do a trial run of aloe vera supplements (no more than 2 a week) to get things moving. also go get a deep tissue massage - there are pressure points on the back that stimulate peristalsis in the bowels. i would seriously recommend a daily enema just to train your bowels to get moving. they are completely safe.