So you are on quite a high dose as far as withdrawal is concerned which means you will feel pretty rubbish. Did you have your colonoscopy and have your mind put at rest? Giving them up will definitely help bowel issues. I had issues for about 4 weeks. Not awful, but it did take some time to clear up.
You have many perfect reasons to quit and life will start again for you soon. But allow yourself the time to go through the withdrawals. We have medicated ourselves for years and it doesn’t happen immediately but it will get better and you will never have to feel this way again.