The best advice I can give you is also a very difficult task- be patient. I am happy to hear that you are eating healthfully, like you said, thats the best way to lose weight and keep it off. The reason you have gained two lbs is probably this- 1. Since you have been starving yourself, your metabolism is running very, very slowly. Sometimes it takes a few days or so for it to return back to a normal speed, and 2. Often when you are restricting, your digestive system gets all out of whack and tends to hoard any food it receives. This is basically due to our natural instincts; you body believes you are in a famine, yet wants to keep you alive, so any food it receives it will keep for awhile in case the "famine" comes back. So again, try your best to give it time. The damage done to a body through restricting can be pretty severe, so it takes awhile for it to work normally again.
Two things you can do to help:
1. Drink lots of water to aid in digestion
2. Give some light exercise a try (just don't overdo it). It'll boost metabolism, even just by going for a walk.
Hope this is helpful!!