Help!!!!!

hi guys I desperately need your help, I bought a apple juice a couple days ago. I drank a glass full. It tasted a little sweet and different. Granted it was a different brand than what I usually get. It was already opened but my family insisted they never opened it. I looked in the juice jug and there are grey specks of particals all over floating at the top. I am freaking out thinking that someone must have poisoned it in the store. ever since I drank it, my stomach has been upset and Im having chest pains. I have extreme health anxiety and really need help with realization. Im really trying hard not to freak out and run to the ER.

youre fine. Apple juice especially fresh squeezed will have visible particles in it shake it up and you wont see them, good luck.