Hi Sushila:
If you are having unbearable pain you need to go in and be assessed by a doctor. It is hard to determine what is the cause or what tests are necessary without being evaluated. Possibly with you having a cold and dry cough, the headache could be sinus related and maybe you would just need some medications to help. But most definately you need to be assessed if you are that uncomfortable.
Good luck and take care,
Tara
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