Sudden Onset Anorexia

Hello. I'm a 28 year old male who has been going through some difficult problems recently related to eating. I've been unable to consume solid food without becoming violently ill for the past month - I've lost over 50 lbs in this timeframe.

I've been to the doctor and no specific physiological issue was noted. I'd like to pursue a second opinion with a specialist, but I'm not sure what type of specialist handles this issue. I can't afford to go to the hospital to be looked over by multiple doctors, so I need to pick and choose the right specialist here from the get go.

Any suggestions?

Thanks in advance for your help.