You seem to be having a lump in your back. Was it been examined or a biopsy of it done any time before? I am glad that you have had CT scan done. Your actual problem seems to be in the neck. Please get the lump biopsied if not done until now.
It is still advisable for you to consult a spinal surgeon to look for any changes in the neck now.
Meanwhile, you can try physiotherapy
of the neck, use a cervical collar
and take Tylenol
in case of severe headache
I wish you quick recovery.