Gaining weight too fast?

I am currently in recovery from anorexia. Big deal. Anyway, I have got about 5 kgs to gain. No problem! I have been eating about 4000-5000 calories a day (I am a boy, 5'8"). Ofc, that makes my stomach pretty bloaty, huge and farty. A bit of diarrhea I might add (big fan of fiber here). Now, that's all right with me. But is there any threat to that?