has anyone just turned their neck so slightly,heard a loud crack,left arm went numb then weeks later

one day a turned my neck ever so slightly and heard a loud crack and my left arm went numb about 3 weeks after that i statred to get these headaches. had mri of cervical spine nothing wrong.

It sounds like you probably have a cervical subluxation. That could certainly give you all the symptoms you mentioned. Have you tried chiropractic and ruled this out? There are a lot of people who get relief this way. I think chiropractic and massage together work better than a spinal adjustment alone. There is a fairly recent post from someone here who had adjustments, acupuncture, massage, and electric stimulation therapy all at the same time with good results. Sounds like it's worth a try. The worst that could happen is you try it, it doesn't work, and you move on to something else.