Could I be?

So I had my period 1/3-1/7/2016. It was abnormally light. I took a couple varied brand of tests and all negative and I took one a day after my period because it was so light. 
For the past 3 days I've been SUPER NAUCEOUS and have had trouble sleeping but I have slept for 9 hours and take a 2 hour nap 2-3 hours after getting up. I've also had killer head aches. Should I spend the money on a test or do y'all think I'm coming down with something?! 

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