The NHS eye consultant keeps moving my appointment because she has to take her a!

The NHS eye consultant keeps moving my appointment because she has to take her annual leave, please help me?

I have been a patient with NHS eye dept for 5 years now my condition is very bad, i see the consultant 2 times per month, but in the last 12 months my single appointment had moved 5 times due to consultant having 4 annual leaves per year, i complained everywhere but nothing has been done, i need her to fill in a VISTA form as i cant support myself , as in 2 month i will go totally blind, and i need her to act quickly, i told her to reply to a refered surgeon if she cant do anything for me? her secretary is even worst very rude & obruct, i have to remind her about other option i can take? instead of secretary informing me about it? its been 2 weeks the complaint officer for Leicester NHS should have called me by 4th June but, now i cant reach her i have left several messeges on her phone.
I trully understand National Health Service, means "come for treatment when its too late" then we will tell you "Its too late", where do i go with my eyes condition? or who to complant to?

If you don't mind, reply to this response as a personal response. Let me know what the condition is that you have. I'll try and see if I know anyone who can help. I don't need 'personal' stuff, just the problem, or diagnosis, what therapies you've had or tried, your current meds, age, race....that stuff.