I am 62; I have had glaucoma now for about 6 years, and have been treated by various eye drops. My most recent has been Cosopt. About a month ago I began to develop terrible itching, burning, swelling around the eyes on my skin, below and eye lids. My Ophtamologist changed my gtts to preservative free. Also she ordered lotamax drops. I am still in agony with my eyes. I take antihistamines around the clock. Any thoughts? Also, I bought a new puppy in October; could I have developed an allergy to my puppy?