"Ophthalmology appointment cancelled"

I was told to come back in 6 weeks due to possible glaucoma or pressure on my eyes EVER since my first appointment I have been in sheer hell with constant migraines which literally knock me out mid afternoon. Called up no reason was given as to why it was cancelled or when I can expect a new appointment. So now I have to pray I can get into my docs for a response or some form of help to get me through this.