I am 24, F. Yesterday my left eye began to swell and I have a unilateral fullness sensation around the eye. I thought it was related to my allergies. But now I do not know if I have allergies either. My nose is runny (only on the left side), with really bad itching, sneezing and burning and clear discharges. My left eye has been affected. It is red, and has watery discharges. I do not have any photophobia, itching, headache, or sore throat. What is this? I am beginning to think my brain is swelling. Thank you.