I can't eat food for more than 5 days and even the smell of some foods disgusts me, is it temporary?

I (27, male) always had an anxiety of vomiting in public since few years ago when I vomited in a bar. Since then anytime that I am full or a bit sick or drunk this fear comes back to me in a public place like a bus or a restaurant. I am, indeed, aware of the fact that it comes to me whenever I think about it.

So eventually I visited my GP and she suggested that it may come from a parasite or an infection. She prescribed me medicine and few days after I started losing my appetite and my bowel movement pattern changed (narrow stool with mucus in it with constipation). I got really scared and started not eating anything and completely lost my appetite, I got dehydrated and at the end they had to hospitalize me because of these weird symptoms. I was in the hospital for 3 days. The doctors checked everything from my blood, urine and stool to ultrasound, xray and even an endoscopy. Nothing was found except for a little bit of an inflammation in my stomach which apparently was not enough for the symptoms that I had. Anyway, after all of this, I still couldn't eat (I just eat liquids and soft cookies). In the end the GI Doctor told me that my situation is 99% psychological and I need to see a psychiatrist. He told me that I also have health anxiety for thinking too much about my symptoms and googling them. He even scheduled a colonoscopy for me to reassure me that there is nothing wrong with me, however in his opinion this was not really needed if I didn't have this situation.

Now I am very scared again! I am back home and still can't eat. Food disguts me. I only can eat a little bit of plain rice or pasta! I'm getting depressed because of this and can't stop googling about various types of cancers and other harsh diseases despite the fact that Doctor told me I  have no serious medical condition.

Any opinion?

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