I have lower abdominal pain, lower back pain, mild nausea , chills, gas, and i ate sushi last night, i think i may have food poisoning ?

Food poisoning?: Raw fish is not a common cause of food poisoning, but it could have been something else you ate. Or perhaps due to anisakiasis, a fish parasite that in the US is most common in salmon. Raw salmon is supposed to be frozen and thawed before eating, which kills the parasite. However, your symptoms are not typical for this. See a doctor if symptoms severe or last another day or two.