You should visit a licensed physiotherapist for treating pain. My friend had neck pain, and gentle stretching helped him much in overcoming it.

Stress affects mind, which results in changing in thinking. This is a common fact that mind and muscles are closely related with each other. So spasm can be the by-product of stress in mind.

Correcting posture while sleeping is necessary for curing pain, I wonder about the affect of wrong posture while sleeping on back, if you are sleeping for 7- 8 hours.

I think you should follow an advice taken from a licensed nutritionist. There are many ways of getting healthy weight naturally, but if you are want to achieve your goals by talking pills,then consultation is necessary.