Thanks all for all the insights and suggestions, it's helpful to talk about it.
It's interesting that everyone thinks that the drops shouldn't cause soreness or other issues. I thought it was just an inevitable side effect and discussed as such on glaucoma forums. I think I briefly was given Monopost by the chemist (though they seem not to be the same product) but that seemed actually worse, which I admit he was surprised at. I am so confused now. But I do also have blepheritis apparently, which the drops can make worse.
Appointment letters are meant to be going out this week (at your encouragement I did call again) so I guess it will be another 6 weeks till I see someone. There is an online emergency line for Moorfields, which is great, but I am not sure this counts as an emergency. Not sure about nurse-led phone line, but I will look again.
@Snapespeare totally agree about having and protecting your precious sight (believe me after a year or two of ops and procedures after a scare, I am very thankful), but I find it oddly difficult to believe that the drops are really doing anything and they have caught it so early I am having to use the bloody things and have the discomfort for 20 years longer than everybody else!
@WineBeforeWhine so I have Hycosan Extra drops, which are preservative free (as advised) but the Latanaprost is not preservative free - make it make sense!
@Shutuptrevor yes, I was advised to put them in a night before going to sleep, which I do. I was using weleda skin food as a barrier, but I think it's too thick and makes my eyes puffy. Also I am not sure whether it's staining that causes darkening or as suggested up-thread by @Allisnotlost1 that it is to do with fat lost.
I never thought I would be so vain, but this rapid-onset aging effect is just depressing. I have never wanted an operation so much!!