Can dental sealants be removed forever?

yesterday my dental hygienist put dental sealants on me. shes my mom's friend and she said that because my wisdom teeth are coming out food is getting trapped in the back of my mouth which gives me bad breath. she was doing a regular clean-up of my teeth and then she did not say anything and went ahead and put the sealants on me... she said "wait for 30 minutes" and although it felt odd i was chewing on some hard material and i'm prone to migraines and this gave me a headache all night. i waited 30 minutes and washed my teeth and ate something so it would wear off so i thought. well today i find out this sealants are 5-10 years and they might cause down-syndrome in kids or babies something. this is all crap from my stupid grandma that doesn't know **** and she was like ok put it on him. please someone help! is the removal hard? i'm also getting my wisdom teeth removed (i don't want to, they're coming out fine). i think all this **** is just excuses for her to get money because my insurance covers it all. please help me!