Can it be the stomach flu?

Got send home from work because i threw up. Last night i also did. Last week i been too. It all started last month. Lately everything i been eating i throw it up. I get hungry i have been eating more. I been sleeping more too and been feeling dizzy. My stomach don't hurt at all but at times i get headaches that come and go. I get moody and been crying for the stupidest stuff. Get lower back pain. And been urinating more. Me and my boyfriend did have unprotected sex January and last month. I tested last Sunday two women on here said they saw a very very faint line i saw negative but my period isn't due until Tuesday so i tested too soon. Ima wait to test until afterwards if i miss my period. Me and my bf aren't trying but if i am pregnant i will be the happiest women on earth! But for now i keep telling myself it may be the stomach flu. Thoughts?