I had cataract surgery two days ago, with a followup with the eye doc today. I began using Omnipred the day after surgery, as prescribed. But every time I use it, I experience INTENSE burning (feels like pouring lemon juice on a paper cut). Is this normal? How long will it last? I have to use it 4X/day - I'm now dreading each time I do. The Nevanac & Vigamox burn a little, but not like the Omnipred! (& yes, I am using them at least 5 minutes apart).