Shop around in the NHS
Time to seek other opinions. Try regional teaching hospital eye clinic for the best clinicians and equipment - say to triage nurse the magic words 'eye inflammation, ghosted vision, worried I have erosion or damage on cornea' to find out what this material is on the surface of your eye. Dear God, they should know. Also need to be on their lists, get some records in place, for chronic dry eye inflammation, follow up at least. If they discharge you and you want to go back, say 'I am Mr ...'s patient' as long as you have attended his clinic (maybe seen his staff), and ignore the fact you've been discharged (they don't mess with the consultant).
The opthalmologist I've been seeing is pretty useless in identifiying what could be possibly wrong ...
Watch the optometrists too - huge variation in skills according to when they trained and further qualifications on disease: maybe try 'health check' at modern young optometrist where they flog LASIK - actually have some experience in dry eye treatment.
My daughter's orthodontist (very skilled professional guy) said his local eye clinic couldn't even find his contact lens under upper lid. It is OK to shop around.
Please post how you are getting on!
Paediatric ocular rosacea ~ guttae cameli saliva secundum artem