IBS-C Help please

Hi, i have had IBS, mostly C for about 20 years. I have tried low fodmap, to a little success, every type of laxative known to man, every type of bulking agent and drinking more water, eating more fiber, exercising, meditation, walking, different diets, different medication and nothing can really provide any relief

All laxatives and bulking stuff does is make me even more bloated, and fart, thats it.

I have little appetite, it feels like i have swallowed a tennis ball and its stuck in my gut every time i eat, if i can go, its only about half of what i should.

My gut makes horrendous noises, is always bloated, gassy, but often trapped gas and stool.

I have tried probiotics, different multivitamins, peppermint oil, ginger, Betaine HCL and a host of other things i cant remember right now

I have bad depression and anxiety and have bipolar disorder. I understand the whole gut brain axis thing and have done a lot of research into nutrition, diet, mental health and the gut in my 20 years, more so over the past 5 years or so.

Im at my wits end, it has gotten so bad i even resorted to buying that moviprep stuff u get pre-colonoscopy, but even that didn't do anything and the feeling of eaten a tennis ball remained

Its making me so depressed and anxious, it even had me hospitalized in a Mental health hospital for a short while as it got so bad

Sadly, Low fodmap gave me an eating disorder which i have not fully been able to recover from, i still binge sometimes and i find it very hard to get it into my head i can eat more than 3 times a day (breakfast, lunch, dinner) If i snack it just bloats me again meaning i cant even summons the courage to force a meal, kowing i will feel dreadful after

My diet is fairly healthy, lots of lean meats, fruit, veg, healthy fats and really only small amounts of things like cake, cookies, biscuits, etc, so really i should have a good digestive system but i do not and its really making me very depressed