welcome to HCM!
On reading your question I feel that you should meet a doctor. You say that it is difficult for you presently, so, if I had been treating you I would go for --an X Ray
neck, and give you some --pain killer and muscle relaxant; these two will take care of your neck pain
and cramp like feeling.
You may take the medicine for four to five days, once or twice a day
& avoid bending, extending and sudden movements of neck,
-- choose a comfortable and not a very soft pillow
If possible, get your blood pressure checked.
Follow these advices along with medicine. Still, if after a week there is no benefit, or there is something on X. Ray neck, then please arrange a meeting with a doctor.
Exact treatment in such cases can be give after examining the patient. Do not worry however, it dosent look like anything major as you never had any headaches
before. So, most possibly it is a neck sprain
which is troubling you.
Hope you get well soon!
feel free to ask more queries
Dr. Manisha Gopal