Debilitating fear of parasites

Ever since I was little, I’ve been deathly afraid of parasitic worms. This eventually turned into a fear of worms in general. Today, I was eating tuna and I found what appeared to be a worm in it. I showed it to my family, they convinced me it was just a stringy part of the fish and my dad even ate it but I was still unable to eat the rest of the fish. I know that it wasn’t a worm that I found but I can’t get rid of the feeling that im infested with parasites, it even feels like theres something crawling in my throat. I’m mostly posting to vent but any advice is appreciated.