Your vet would probably give you Metacam for him, which is good at walloping pain. By 'follicles' does the ophthalmologist mean that Harley's eyelashes are rubbing against his eyeballs, causing irritation? If so, some soothing eyedrops might help - again your vet can suggest (I find Optrex Soothing Eyedrops from the chemist as good as anything, and it's not very 'druggy' so OK for dogs and usually doesn't interfere with other medication).
Get your weapons organised and your armour on, friend - you've got a fight on your hands to get Harley comfortable!
Kate, Oliver and Aled