Any suggestions about rectal prolapse and fecal incontinence.

One annoying result of having had a bad case of Giardia (3+ years ago), followed by 3 years of continuous IBS-C is a case of rectal prolapse (not severe or constant, but very annoying nonetheless), and occasional fecal incontinence (big hard stool in the underwear). I do not want to have surgery for this. I do Kegel exercises which help a little. Any suggestions about how to improve this short of the surgical route? Thanks.