unknown sickness

for the past couple of months i have been dealing with some really annoying sickness. it all started a couple months ago went an ate a dish called Kitfo ( a traditional meal that has raw meat), this is a meal i have eaten many times without any issues (just incase anyone is wondering i don't follow a raw primal diet) . Anyway since i had eaten it, i had experience symptoms (like nausea, vomiting, fever, and lots of diarrhea) that lead me to believe i had food poisoning.

after a about of week of suffering i finally go to the doctor, they make me do some type of breathing test, and make me shit in a cup to check if it is food poisoning, weird thing is nothing really shows up. ever since then for the past couple months i have had a continuous terrible appetite, i can barely stomach a full meal. i also have periods where i vomit quite a bit but then it stops and then comes back again. and this has been what i have been dealing with. More recently i have also started waking up with terrible stomach aches.

my mom has been holding me off from going to the doctor again because she thinks it's just because i am "eating bad foods" and that it would be a waste of time and money. so i was wondering if anyone else has experienced this too, or if anyone has any idea of what might be going on.