OKay you made a mistake. no point stressing yourself over what has already happened. I am sure in 6 months you did not completely undo everything. All it tells me is that you were not completely rid of it to begin with. And it should not take you 3 years in any case. IMO. You can simply launch an all out attack. Get back on the diet, no cheats, Bowel Cleanse with garlic enema ( garlic juice 1-2 cloves worth in plenty of water). NO its not fun but it always gets fast results with me. pb&c shakes every other day. Lots of raw garlic and my bet is that in 2 weeks your symptoms will disappear. BUt that does not mean you are over it. You must then keep cleansing, stay on diet and reintroduce healthy bacteria. After that slowly test different foods. Start with only a bite , wait a few days, then try a few bits something wait a few days. Very gradual, be conservative. Any reaction indicates more bowels cleansing etc is necessary.
Can't do anyhting about the past, it is a waste of your time to dwell. Pick yourself up dust your self off, and get back on the horse.