"Appointment for removing lower right wisdom tooth"

I've been sent to hospital by my dentist to remove wisdom tooth because it have very long and thin roots. That was in november 2014. From this time I am experiencing massive pain in my tooth, eye, ear basically half of my face. After 3 months I get a letter saying that I've missed an appointment. I tried to call them straight away but no one answered. I found an email address which was on the official letter. I've send a letter to get in touch but no one answered. I was struggling with this pain and I've lost my job because I had too much time off to go to dentist with massive pain. I called today once again to hospital. Now somebody answered the phone but my appointment will be next Tuesday. I get depression because of all this, things haven't been sorted for so long time and loosing my job. For me it is incompetence at maximum level. They was trying to tell me that I didn't change my address when I moved but I did it in every single place with my partner the same day we move to new address. I have now infection which is giving me lots of pain. I'm a Jobseeker and I'm now unable to do simple things because of this pain. I can't eat and think properly because of this. Please help me!