Thanks for all these additional details.
I am sorry to hear about your problems.
From the description, it sounds to be Cervicogenic headache . This is one of the most common types of pain in the back of the head. This pain is typically located on just one side and may radiate around the side of the head.
As you said, pain becomes severe at times of turning neck to right side, so this confirms Cervicogenic headache.
Cervicogenic headache is referred pain perceived in the head from a source in the neck.
Possible cause in neck are- degenerative cervical spine disease (arthritis), a disc prolapse in the neck, or a whiplash injury or nerve compression.
This condition, would sometimes get worsened by looking up or down for a long time, or with activities such as driving or reading a book. It also feels better with rest or lying down.
You would be advised Nonsurgical Treatment to cure such symptoms, It includes-
1.Physical therapy- Therapist can advise cervical (neck) traction and posture therapy . Also Strengthening and stretching weakened or strained muscles would be helpful. It is usually advised for 6-8 weeks.
2.Use of medications like- Acetaminophen and Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and and naproxen would be helpful. Doctor can also advise for Muscle relaxants such as cyclobenzaprine or carisoprodol.
3.Soft Collars would also be helpful, It would limit neck motion and allow the muscles of the neck to rest.
4.In case, symptoms don't improve with above treatment then, Steroid-Based Injections can also be given. A short course of oral corticosteroids may also help reduce swelling.
5.You need to apply ice packs on cervical spine for 10-15 minutes and it can be done 3-4 times a day
Most likely with above treatment you would feel better in next
I would recommend that you visit your primary doctor and and get it managed.
Hope this helped
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