 [ Symptoms ] i had an allergic reaction while taking a shower i am not allergic to anything or any medication [ Disease ] hey first of all you have to move to fresh air imediately drink a lot of water and milk right away unless you have symptoms that make it hard to swallow these include vomiting convulsions or a decreased level of alertness and in that case you need to go to er you can also go to the hospital to take an oxygen therapy session