sorry to hear that !
Based on the information you have provided u have enough knowledge of sunburn
, I guess so!
The description do seem to match with what you are describing, its seem 1st degree burn with excessive swelling.
try to answer the following question for yourself
1) are allergic to any other skin cream ?
2) did u had any sour food after having that issue?
3) are u having any trouble with vision?
4) is it to painfull ?
5) is swelling getting worst?
6) did benadryl
did help little/ at all?
if answer to any 2 question above is yes YOU certainly needs to take medical attention.