I can totally relate to you. I've been dealing with my eating disorder for six years and it really sucks because I love food and eating and being able to just have a normal, worry free life, but it seems that every time I try to recover, I relapse and it's worse. Well first off, if you ever need anyone to talk to, feel free to talk to me if you need help on the subject. Second, I'm currently in recovery (hopefully for good this time) and this is the worst I've been bloated and the longest. I've found that if I drink oolong tea, it helps with stress, but peppermint tea is perfect for indigestion, bloating, IBS, etc. Also if you have any epsom salt, take a hot bath with about one to two cups of epsom salt in your bath and soak in there for about 20 to 30 minutes. This helps with all the water that is being saved in your body. Don't do this all the time though, it may dry out your skin. As for the ab workouts after meals, that could be creating bloating because of the positions you may be in. Cardio is the best thing for bloating, but what I found works best is go on a walk after eating and then wait for your stomach to completely settle to do cardio like running or hiit workouts.
Well that's about all the help I can give you, but I hope you start feeling better soon. Stay strong