As I am sure you are aware, dedlaying treatment is prolonging the inevtiabe, and it is only goiong to get worse.
Make an appointment and see what your dentist has to say. You will probably need several visits to get your teeth properly in order. If you are phobic, ask if you can have a diazepam prescription - just a 5mg tablet will relax you enough to be able to be treated without worrying.
I do sympethise, I neglected my teeh for years, and did loose two when I eventually went. All the rest were saved and serviced, and I have been treatment-free for three years now - it really is worth it, believe me!