Hi,stomach problem! Please help :( *Details inside!*?!

Okay, so recently I have been feeling a little sick to my stomach. The only way to describe it is it feels like I ate wayy to much, and now it feels like I have to throw up. I have felt this way since early monday morning, but on that monday it went away during school and came back when I got home. On tuesday, I actually threw up, and like I had the shakes all day but I didn't throw up anymore. Yesterday, I felt the way I described the whole entire day, even during school. And I randomly got dizzy during the day. Today it kind of subsided during school, but then when we got home, I had piano, and all during piano I felt so sick to my stomach!!! It is worth noting that I haven't barely eaten anything this past week, because I have felt so sick. Does anyone know what this might be? I don't want to go to the Dr's unless I have to, because I am kind of afraid of the Doctor.

About me:
I am 14
nobody in my family has been sick.
I have NOT had sex, ever.
My cycle isn't due to start until next week, and I have never felt this way before a cycle.

Any help would be awesome!! Thank you so much!!