I can only speak from experience of bowel and anal problems - not a medic!
You are obviously very anxious about this and that will not help. Bowel problems are very uncomfortable and disabling, so at a practical level, you need to try and address these. Are there any things you can do to relax a bit?.
You probably have some very sore spots, possibly scarring from your isssures just inside your bowel which makes things feel as if things are stuck, so a suppository type of treatment may help to ease that.
You should look again at diet and persist with it.
Sorry I can't offer a cure, but like all these things it may be a whole series of little steps that ease it. Try not to force anything, or to go too often, it just seems to make things worse in my experience.
I really hope that things improve - only sufferers know how embarrassing and debilitating it can be!