Caffeine allergy??

Read a post below where a few individual seemed to develop an allergy to caffeine seemingly overnight.  THIS IS AMAZING!  This past April I spent 6 days in the hospital and when I got out I felt great and my allergies seemed to disappear.  My eyes were clear, no head congestion or tingling sensation in my hands or feet.  While in the hospital I did not drink any coffee, tea or soda.  Basically water and cranberry juice only.  

I have kept a food diary for the past 2 months and cannot seem to pinpoint what foods are causing me problems.  That is until I read the post about caffeine....I was not writing down the green tea I was drinking.  I have suffered from an unkown allergy problem for the past 3 years.  Severe depression, anxiety and all kinds of food intollerances.  I remembe about a month ago...I had to go to work very early one morning and did not have time to make my green tea.....I felt great all day and slept great that night.  The next day I resumed drinking green tea and have felt like crud every day.  COULD THIS BE IT?  I never dreamed I would be allergic to caffeine but it is starting to make sense.

On a daily basis I sufffer from mental problems that cannot be explained like severe brain fog, memory problems, depression and anxiety. I come home from work fatigued beyond belief and get the cold chills and feel detached.  GOD...I hope this is it as I am at my ropes end.  WISH ME LUCK!