Dear friend, welcome to Healthcaremagic!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
I do not intend to scare you, but your symptoms are classical of a brain lesion (like a tumour).
Headache, nausea/ vomiting
(altered smell sensation) are signs of a raised intracranial pressure ICP), likely due to a sellar tumour/ pathology.
Do you get altered vision, giddiness, imbalance?
I would advise urgent medical attention and evaluation to confirm or rule it out.
A CT scan
head would be advised.
Till then you may take simple pain killers like Paracetamol
upto 1 gram 4 times a day and a chewable anti-emetic like ondansetron
I hope to have answered your query satisfactorily. I would be glad to answer any further queries. Take care and please keep me informed of your progress at http://bit.ly/Dr-Prasad-Akole
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