Random Vomitting

Hi. So i recently had thanksgiving dinner with my family. I loaded up on a lot of food and it was all great. Soon afterwards, I feel verry stuffed. A few minutes later, i started to feel really bloated and queezy and i went to the restroom and just randomly vomitted all of my food up (ughh). Afterwards, I felt COMPLETELY FINE. Before and after i vomitted, i DID NOT FEEL SICK at all. i even had my seasonal flu shot at krogers a few weeks back. However, i have not had much of an appetite in the last month because of my mood. Im just wondering if i ate more than my stomach could handle and maybe i wasnt used to eating that much? I was also born with PKU(Phenylketonuria), where i obey a strict-diet of only 4 grams of protein per day. My diet is limited to fruits, vegetables, specially-ordered foods, and a daily metabolic formula that contains all the vitamins/minerals i need to stay healthy and strong. anyway, i was hoping to get some expert advice on this random vomitting and if it has any relation to my decrease in appetite or my diet.