If you want to heal do not do oil or salt. You may need to stay on raw and eat a very gentle raw diet for 6 months or so to heal any digestive damage due to your past history. Then add one thing at a time to see how you react.
What type pf water do you drink? distilled is best.
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Two suggestions off the bat are to go on a mediation course to learn a wonderful technique that teaches you how to master your mind which will help eliminate the stress factor for your digestive issues: https://www.dhamma.org/en-US/index
And I might try powdered vitamin C to help with elimination, if you take as much as you need to make you have a loose stool it will cause a bowel movement with no side effects.