From the information that you have given it looks to me that you are suffering from "Fibromyalgia". Amytryptiline that has been prescribed to you is not for depression
. It is actually for your fibromyalgia and you have also specified that this drug helps to relieve your pain and it makes sense.
Please get a thorough check up from a senior orthopedician and get your reports reviewed to see if anything in your report suggesting bulging of disc in the neck.And later you can continue using amytryptiline.
I would suggest you try to relax and destress with meditation
and other destressing activities. You can try learning more about Fibromyalgia on internet.
Hope it helps
Dr.Soumya Nagaraja MD