ev, when I start exercising a lot, it increases my appetite, so I've often had the experience of exercising and gaining weight.

One thing I'd like to caution you about is, over-exercising can also be part of an eating disorder. Also, if you have just recently stopped purging, your body and your metabolism are probably still recovering. Try to focus more on doing the right things rather than what you weigh for a little while (I know, that's really hard, but try), and see if things stabilize.

Good luck,
Jo