Oh! I've never been thought of this! I'll try it. 
Thank you

How old are you Treetop, i.e. could it be menopausal? I haven't tried them, but you can get stuff like Replens from all major chemists. Might be worth using some last thing at night, or before a booking.

Do some condoms make it worse, maybe try switching brand?

Also bear in mind it could be partly psychological, i.e. if you're nervous about being hurt, you'll dry up even more.