HELP!!!!

Hey ladies, so I haven't had my period since June 15th and I have tested 4 times and it came out negative. I've been having a lot of symptoms lately like when I eat certain food I get really sick like I feel like I want to throw up, I get so tired and like I feel like I need soda like really bad, my boobs get sore sometimes too and I just don't know what to do when I'm getting negatives on a pregnancy test, what should I do?