Just seen this thread - wow sorry to hear about your situation rosie
It sounds like your corneas arent very happy hence the extreme dry eye symptoms. This will most likely make your corneas swollen which will increase the short sightedness and cause lots of glare and light sensitivity. The high pressures - did they say how high? Did they say if you had iritis/uveitis after the op or any kind of infection? Have they mentioned any NSAIDs (non steroidal anti inflammatories) or even steroids being an option? Overnight, have you tried any dry eye creams e.g. lacrilube? Messy but lasts longer. Longterm, things like scleral / bandage contact lenses can be used as a shield if the discomfort is still severe.
To the OP - if correcting shortsightedness in your 40s, please be aware that most people have a longsighted shift at 43+ so youll need reading glasses soon unless they try monovision where one eye focuses for distance and the other reads but depth perception is buggered.