So like 5 days ago i had bad nausea and fever i vommited 6 times and had diarrhea, and now its almost a week when i feel weak, my stomach isnt working , i stopped vomiting but i still feel that food i eat isnt digesting and i burp alot, i also feel a tension in my neck(under jaw) and i got no idea what is happening to me and what to do
Sounds like you ate something contaminated. Get a medical checkup.
Have you been to the doctor? Sounds like you had a bad stomach virus, and those can take weeks to recover completely from. See a doctor to make sure though.
Could be a bug which can take time to disappear; wait a week to see if you feel better. If symptoms continue, see your doctor. Eat blandly and avoid rich, spicy and fatty foods.