I Am A Paraplegic For 40 Years, But Have Had

I am a paraplegic for 40 years, but have had wound issues of the buttocks in the past four years. If I sit more than an hour when my bowels move, I have developed a wound which bleeds even though I use bandages with Puracol on the wound. I started using Colace and Senna occasionally. I get very loose stools and I hesitate to continue that. Also I try to increase fiber in my diet. What else could I try?