Eating raw fish from the supermarket, could I have a parasite?

[payasitabebe]

Stop being confused and paranoid. Just be aware that any raw meat we eat can give us from parasites to food poison.
Stop thinking and worrying about it, if you feel ok there is nothing to worry, the only thing you will attract by being scare and paranoid is attract bad things to your life.

 

[Jesea]

Ok so I went to the market today and I noticed they were selling tuna in the seafood section. I started talking with the guy behind the counter and he asked me if I wanted to use it in sushi. I didn't ask if it was sushi grade or anything like that, and I could kick myself for being so stupid. But I bought it and ate some of it for dinner tonight. That's was maybe four hours ago. I haven't felt sick or anything like that, I feel perfectly fine but I've suddenly just gotten so paranoid that something could be wrong. Is it possible to get a tapeworm with absolutely no symptoms of pain? I know people can live for months with those things inside them before they're removed and that they can grow really long. I also know that tuna doesn't carry nearly as many parasites as other fishes, such as salmon. I'm so confused and scared, does anyone have an answer? Could I possibly have a tapeworm?