Should I ease back into eating normally?

The past month has been rough. I have been dealing with a long, emotional, and devastating (not to mention, ongoing) break-up, as well as significant stress and trouble at my new job. Needless to say, the severe emotional distress has left me with the oddest diet imaginable. On some days, I just have no interest in eating and end up by dinner time having only eaten a bowl of yogurt and a banana. I probably, over the span of two weeks, have averaged around 900-1200 calories a day.

I lost 10lbs after about 2-3 weeks. I gotta imagine some of that is water and muscle, as I don't exactly look a ton better (my pants however, fit MUCH better).

Now that I am starting to get my appetite back, though, where do I go from here? I don't think I can just go back to eating normally again. I should add, as well, I don't exactly want to put the weight back on.

I am a male, 29, 158.5lbs. My ultimate goal is to be a lean 145-150lbs. Any advice?