I had ever very bad chemical food poisoning after drinking fruit juice. The vomiting had passed, but the stomach was still uncomfortable. No appetite and little urine production. As the effect just wouldn't go away, my doctor prescribed some antibiotics for me and those did work really quickly and well.
So, I advise you, if it is really unbearable, to go to the doctor's; if not, wait for some time and your body will heal itself. During this period, drink liquids as much as you can to flush out your system. Good luck!