Hi, Thanks for using HCM.
Since more talking on my mobile and lifting weights, you feel neck pain
and this causes head rotating and instability in movement. Your certain neck posture may be compressing the spinal cord
or putting pressure on the CNS. Get Dynamic CT scan
and examined by your doctor for any problem(Cerebellar / cochlear). Use your neck collar regularly and do suggested neck exarcises.
Hope I answered your question. Feel free to ask me if you have any further queries. Wish you good health. Take care.