Can an allergy cause the following:-?

Red throat/soft palate, scratchy/itchy tonsils, coated tongue, throat congestion, nasal congestion, blocked sinuses, itchy around nose, itchy skin, coldness to tongue?

Can an allergy cause the following:-?
I had a sister that went temporarily blind from too much caffeine. She drank so much diet soda that the caffeine in the soda made her blind for 3 1/2 hours while she was at the mall (Scary). The doctor told her she had developed an allergy due to overexposure to caffeine. Now, all she drinks is caffeine free diet soda. Allergies can produce all sorts of reactions in the body.
Reply:yes it can allergies can do alot
Reply:yes they can,allergies can cause all those symptoms and more.But that can also be a sign of a throat infection.You really need to have it evulated and probably have a throat culture to rule out strep.The allergen that comes to mind when you describe these throat symptoms is dairy specifically cows milk dairy.Avoid all dairy for a while and see if it helps,but at the same time you need to make a dr's appointment right away you dont want to mess around if its strep!
Reply:I have really bad allergies and i have experienced all the above except for the coldness of tongue! Usually, the itchy skin is due to skin rashes and if heated enough, it will surface! I would go to the doctor and see if he think you need to be tested by an allergist.
Reply:Allergies could cause those symptoms, but it sounds more like an infection. I would go get you doctor to check it out.