The pain is because of corneal involvement.
Welcome to Health care magic
Iam Dr. Dadapeer K, an Ophthalmologist and I answer health problems related to eye.
It seems from the history that you are diagnosed with severe dry eyes
and you are on treatment with steroid
eye drops, fish oil, restasis
eye drops and duct plugs.
But the artificial tears
which are the most basic drugs used for treatment of dry eyes are not mentioned here. Hence along with the above mentioned drugs you need to use artificial tears eye drops.
Now coming to your questions of blurring of vision, ocular pain and headache..
These symptoms indicate problems in the cornea like corneal epithelial erosions or punctate keratopathy. These corneal problems are common in severe dry eye.This requires treatment by using artificial tears eye drops. The artificial tears eye drops needs to be used as frequently as once in a hour.
If the pain does not respond to artificial tears, soft bandage contact lenses can be used.
Hence I advice you to consult your ophthalmologist to rule out corneal problems like corneal epithelial erosions, punctate keratopathy...
Hope I have answered your question and the information is helpful to you.