What is wrong with my eyes?

Lately I've been having eye redness (very red) with swelling. I have always had sensitivity to light, but it is worse now. It hurts to focus vision sometimes and eye movement feels like I've been punched. Went to doc's office about 3 weeks ago. She gave me antibiotics and prescribed Azelastine HCI ophthalmic solution. Finished antibiotics and used the solution as prescribed. Symptoms went away for about a week. I also take zyrtec for allergies. I do not wear contacts or glasses. I checked my vision 6 months ago and it was 20/20. Now what?