You need to remove numbers from your post. They're against the rules.
Also, this sounds like something you really need to speak to professionals about. We can't advise you safely.
Generally as you said, you need to be a healthy weight and able to eat enough to maintain that weight before adding in any type of exercise. Then if you are adding in activity, typically that is also going to mean increasing the amount of food you eat as well to account for additional exercise.
Talk to a professional and be honest with them about things. You're posting in an eating disorder board for a reason, so I'd guess at least part of you realizes that things aren't okay.