Neck pain and headache and arm. Pain.

It's been three months first it started with my head ache and it didn't get better for three days so I took painkillers and tied a cloth in my head and went to sleep next morning my left side neck and head started to pain thumbing dull pain ,I went to neurologist and took medicine he thought it was migraine and infection but it didn't get any better then  it also started in my left shoulder.I went to orthopaedic doctor he told me it's due to posture and told me to get physiotherapy ,the pain reduced but not fully diagnosed ,my head used to feel pressure when I lie down so much pressure like  something is pushing from above ,I got ct scan it was normal ,x ray of neck ,ribs were normal , ultrasound was also normal.then I went to a physician he told me my vitamin d is low and prescribed me medication it's got better but now when I sleep straight in my back my neck hurts all night when I get up in morning and do exercise is again normal I cannot keep my head up for more than 2 - 3