hello-- Had some of the SAME issues after my cataract surgery a year and half ago.
Pain in left eye and also flashing blurring. Told--dry eye, then floaters, then moving lens, then mites, then cornea neuropathy, and moving iris!!!---probably 10 top ophthalmologists!---
they really don't know....But I suggest you do see a neuro ophthalmologist to check out the cornea nerves....where are you located?

Here is a great medical article worth reading.
https://www.aao.org/eye-health/diseases/what-is-neuropathic-corneal-pain-2

Update on my treatment and current condition. Will appreciate any insights and guidance
1. have been on autologus serum for 4 months and Bronfenac (as needs for pain)
2. Pain/dry eye was getting better, then last month both pain/dry eye and vison (large brown shadows) got worst
3. Doctor (cornea specialist) suggested perhaps cataract surgery was a wrong decision due to past Lasix (he did not do the surgery)
4. Next steps i) see Dr Anat Galor in Bascon-Miami (she is doing research in optic neuropathic pain) ii) increase concentration in autologus serum iii) try Clobetasol steriod eye drops.
5. Questions - i) Has anybody tried any medicines for neural pain, including medical marijuana ii) any experience with Dr. Galor iii) Any personal do and dont to manage pain and dry eyes.

Thanks in advance