Stomach pain 😭 Help

Hey guys im not sure if this goes in this group but i’d appreciate the help/opinions.

so lately I’ve been feeling like I can’t eat. I’ve noticed I stopped eating in the mornings I just can’t eat like I don’t crave breakfast the sound of eggs makes me wanna throw up. Anyways Lately i’ve been feeling nauceous and tired (assuming because I haven’t ate well) I do eat at least 2/3 meals a day with snacks on the side too.. so I’m assuming it could be the stomach flu?!? I don’t throw up I just feel like somethings stuck in the middle of my stomach 😭 best way to explain it.. my periods are irregular, and I haven’t gotten my period this month last period was 5/2/18 but I’m irregular lately and I tested couple days ago and it was negative.. any ideas what it can be?