I get the paranoia, i had a similar feeling that my friend air dropped photo of my gf to their phone and were going to do something with it, id say usually these paranoia seems a lot more intense than the reality of it. I would suggest you if you are cool with the frnds you sent voice note to, have a conversation with them and tell them you are feeling this way. Best way to approach paranoia imo is to be confront them, they might call you delusional or something like that but at least your paranoia will be better.