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Due to forceful vomiting
especially in cases of self induced vomiting, minor tears in esophageal (food pipe) vessels may occur which may induce inflammation. Also due to acidic content of vomitus irritation occurs which also induce inflammation. Due to inflammation in oesophagus, throat swelling, redness
occurs. It becomes difficult to eat or even swallow liquids. Pain is chest may also occur. But in rare cases of forceful vomiting esophageal tear may occurs and which is a serious condition. So try not to self induce next time.
If pain persists visit ER for management.
Also as you have mentioned that you are taking medicines for Bulimia Nervosa
and continue these medicines. Attend behavior therapy sessions for quick recovery.