This is Dr. David
I am sorry you had a nervous breakdown.
there are medications which can help decrease anxiety symptoms
you need to see a doctor who can prescribe you anxiety medications.
severe anxiety can cause your stomach to produce excessive stomach acid which can cause nausea.
you may need to take stomach acid reducers like zantac, maalox, mylanta to decrease stomach acid to help the nausea
have you taken stomach acid reducers before?
did your doctor recommend anti-anxiety medications for you?
you are in a bad state now since you are not able to eat
you need to take something to decrease your anxiety symptoms.
if you don't take anything, your anxiety symptoms will continue to be bad.