Thanks for providing more information.
Firstly about your headache,pain in neck,shoulders so yes your arthritic changes in neck(cervical spine) is contributing factor resulting in cervical spondylosis and cervicogenic headache.
And persistent long term use of computer,hectic schedule in school are aggravating agents.
So you need to take short breaks of rest while doing work.
And as you have GERD,so taking Ibuprofen for long term use is not good.
It's a good idea to consult your regular doctor for a clinical examination and repeat X-ray of cervical spine should be done in your case.
In the meantime you should do gentle massage with muscle relaxant.
And continue to apply warm compresses with a heating pad.
Take OTC Tylenol.
Hope this helps.
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