Pregnancy test was negative but...

Last week my period was to start on Monday but didnt, Wednesday took a pregnancy test and it was negative, Friday period began but ended on Saturday (and it wasnt normal).

This Wednesday I began getting sick to my stomach from taste of sugar. Then starting last night, I fix a plate of food but cannot finish the plate without getting nauseous. Today I fixed a small sandwhich and after forcing myself to eat it- I threw it up, and feel like I want to again (cause house still smells like the bbq from my husband's lunch). And the throwing up made my head hurt (feels like a migrane).

I took some Pepto but its not helping any. I cant stand the thought of eating or drinking anything.

What you all recommend to settle a stomach? Mom says Coke, but the sugar is really getting to me.