[lm.]

Just to add another idea: Depression can cause a person to eat too much or too little. So if you've been diagnosed with depression, it might be another factor to consider when looking at your eating habits. (Especially if you forget to eat or if you feel like you don't have the energy to eat)
Anyways, I agree with the posters above. We can't diagnose you, but it seems like you may be showing signs of an eating disorder. It might be a good idea to look into getting some help in order to make your eating habits healthier and to deal with any issues that may be causing them.
I think it's great that you've found a friend to talk to! Having a support system and someone to talk things out with can be so helpful. Take care.