FNA Biopsy on Parotid Tumor

Sept last year I got a FNA biopsy and Nov I was told I had a benign growth on the Parotid salivary gland that needed to be removed asap because FNA is not 100% and the growths can turn into cancer. I am still waiting to get it removed with 2 cancellations for the operation already one in May and now the op has been put out another week to the 28th.
Is it normal for a biopsy to take 2 months for a callback and is it normal to have to wait 7 months to get the tumor removed. I have been in touch with ENT to tell them that I am now having problems with turning my head and vision greying out, the corner of my mouth has a slight droop and yesterday thankfully only temp my eyebrow also dropped.
I am concerned as in the last few months symptoms are getting worse and many others with the same problems have had biopsy results that that said benign were actually cancerous after the tumors were removed and examined.
Any info, pointers etc would be appreciated.
Sorry mind is going op is 21st.