Hi, I Think I Had Food Poisoning. Was In A

hi, i think i had food poisoning. was in a meeting yesterday and suddenly felt very flush, like i needed to faint. that quickly turned into needing to vomit. after vomiting a few times, i went home, laid down with chills (alternating between hot and cold sweats). this lasted all afternoon and evening. around midnight, i was able to eat some soup. today i feel somewhat better, but still have abdominal cramps and feel overall weak. my neck now feels stiff, is this cause for concern? or am i just dehydrated?