My advice is to read this: http://180degreehealth.com/2013/07/eating-disorder-recovery-update
My other advice is don’t go crazy. You had issues with low-carb, but that doesn’t mean you need to switch to all all-sugar diet or something. IF is probably a bad idea and should be stopped, and you need carbs, but the best approach to begin with may be just adding in some carbs and seeing how that goes, then adjust as needed. Eating 3 meals/day and maybe 1-2 snacks, at regular times is really important. Make your body feel safe that you are feeding it. The goal is to eventually get to intuitive eating, where you are eating the things your body is craving. Also, make sure you work on stress reduction and get plenty of sleep.