You don’t need to be convinced, because I’m not trying to convince you.
I’m just offering you my personal thoughts. It’s up to you to decide whether these thoughts do, or do not, apply to your situation. No-one but you can do that.
I can only tell you that in my situation, medications didn’t work either. At most, they only reduced the symptoms somewhat, and only for a limited time. This included my IBS.
So your current situation is almost identical to my past situation. Therefore, I share the way I recovered from that situation.
Again, it’s up to you to try going the same route, or to ignore my advice. Whatever you decide, you will neither harm nor benefit me. It’s entirely your own personal choice. I can only offer my experience, which is exactly what I’m trying to do here.