Hi I had pretty much identical treatment to you and a very similar diagnosis. I guess I'm lucky because I didn't have much trouble with the hormones. One of the posters on here really couldn't stand the HT and stopped it after six months, other than that most people find it at least tolerable.
The main benefit of HT is just before and just after RT, by the time you get to 18 months post RT it is probably only adding a marginal benefit. So consider stopping early, however if you did get recurrence I think you would spend the rest of your life thinking, maybe you should have gone the extra six months.
It is probably the case that if you did stop HT now it would still take six months or a year to get back to normal, so perhaps a better approach would be to treat the mental health issue, the problem is knowing exactly what to treat, it may be anxiety or depression, but I don't really know if being over emotional is in that class of illnesses.
Discuss the best option with your oncologist or CNS, if stopping HT is ruled out then, them writing to your GP, asking them to treat the side effects of HT might get you further up the queue than waiting for a GP appointment.