Here as per your explanation looks like you are deficient with calcium and vitamine D but you have also inform that you already have started having vitamin D and calcium tablets. Here, I suggest good you have started with it but as per my suggestion I always give natural organic supplement source tablets for vitamin D and calcium. So you can have check once in what you are taking, Apart from this neck pain and pins and needle sensation at back could be related to spinal issues like problem at spinal curve, problem at spinal disc, inflamation in entire spine ( spondylitis ) , degenerative disc issues, etc. How ever the conformation will be done by MRI of entire spine. And based on report here ortho pedic doctor will suggest for treatment. If there is major issue then you need to go for possible surgical correction and if there is mild to moderate problem then doctor will ask you to follow up with medication and physiotherapy treatment. I suggest also take suggestion from physio for postural correction and spinal exercises for long term relief as well to improve strength and stamina of spine. You can also use hot and cold pack for some more relief. I am sure you will be fine if you follow all above advice a step by step. Take care.