Are there any treatment methods for summer allergies?

Every summer, due to intense sunlight, sweating, various insects, and unknown contact with poison ivy, I end up visiting the hospital once or twice.

Even though I try to endure, red spots appear here and there, I scratch and scab, then scratch again. My sister who lives in the same apartment keeps telling me to stop scratching whenever she sees me because it makes me even more itchy.

I went to the hospital, but is there no way to treat this recurring allergy?

I'm feeling sleepy after taking medicine, so I'm drinking tea and dozing off.