Really really bad bloating issues - advice needed!

I am a 15 year old girl suffering from anorexia, height 166 cm  and weight 39 kg. Yesterday I severely restricted because I thought I had binged the day before, and today I have eaten quite a bit more than usual. I have really really bad bloating and indigestion, I am badly constipated and my chest hurts. Is this due to the fact that I restricted and then started eating normally again??

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