Any medicine recommended for CGRP , severe headache and migraine, jaw pain.

Ans: Hello Vijay
Please consult your dentist soon rather than suffer. A clinical examination will usually reveal which tooth/teeth are affected. It's very likely you have deep untreated decay somewhere. From your symptoms it appears that there's a low grade infection somewhere. Since you cannot precisely pinpoint which tooth is paining a full jaw Xray (called an OPG) may also be necessary in order to reach a proper diagnosis.
Once the affected tooth/teeth are identified and the appropriate treatment done you should be able to eat and drink comfortably.

Ans: Migraine is caused by multiple reasons, Naturopathy recommends that you identify the cause and then look for a suitable cure accordingly. It can be controlled and even cured by naturopathy therapies, but you need a proper consult. I suggest you visit a Naturopath or an Ayurveda doctor for a complete wellness plan. Until then practice 10 mins of alternate long breathing morning evening on an empty stomach.

Ans: For neck pain please do visit physiotherapist and rule out cervical spondylosis

Ans: Hello
It’s sad that you've been suffering for the past 4 years and no lasting solution has been provided. It is quite possible that your problem is not dental in origin. You have clearly stated that you have consulted several dentists (including a TMJ specialist) so it is safe to assume that you no longer have any untreated dental infection or abnormality.
My advice to you would be to consult a reputed Neurologist or Pain Management specialist.