Yes psyllium husks is fibre…but I don’t really understand why you can’t have it? Is that just digestible fibre? The psyllium husks are indigestible so maybe that will make a difference.
It seems contradictory for GP to not be allowed fibre…fibre helps your bowel movements so without it your GP symptoms might not be worse but your bowel movements won’t improve. The psyllium husks are also used as a regular dietary supplement to improve and maintain regular GI transit. The inert bulk of the husks helps provide a constant volume of solid material irrespective of other aspects of the diet or any disease condition of the gut. But if you are unsure, it might be best to consult a specialist before undergoing the cleanse. I don’t want it to worsen your condition and I’m no expert.Have the consultants you’ve seen not been able to suggest what you can do to cure the condition? I’ve read that the antidepressant mirtazapine has also proven effective in the treatment of gastroparesis unresponsive to conventional treatment. So maybe ask your doctor about that.
These doctors can’t just leave you to suffer with your condition. I think you need to get the GP sorted before you feel better. I read that if medicine hasn’t worked, surgery would be the next step. If they’ve been able to diagnose it they must know what has caused it and you must push for answers.