Been throwing up after eating

So for the last few weeks I have been throwing up almost every time I eat. I've actually lost quite a bit of weight. I've also had my period twice since this began. 1st time period began just after the nausea & vomiting began & I just started my period again. I physically feel perfectly fine until I eat. Any ideas on what could be wrong? My periods have been normal so I don't believe I'm pregnant, but man something's gotta give here! I don't have insurance so I don't wanna go to the doc.