Spewing is a great way to lose weight! The treadmill is a wonderful diversion from your bulimia.

Don't get too discouraged! Let your body rest and then start smaller and/or slower. You got this!

Nevertheless, you're making the effort to improve. It's not going to always be a perfectly smooth road, but the important part is to keep trying - There's no shame in starting slow.

From someone who's done that a few times, it helps to find a few gentle exercises--yoga, chair exercises, that kind of thing--and practice moving while paying attention to how your body feels. When you've gotten the hang of that, you should be able to tell what exercises are helpful and what aren't. It sounds like running isn't something your body likes doing, so taking the time to find out what DOES work will help more in the long run.