am i making my teeth worse by using a partially broken retainer?

i’ve had the same clear retainer for years and i’ve worn it every single night. i did my best to take care of it but since i grind my teeth, i’ve weakened the back part of the retainer over time.

back in march, the back right portion snapped off. the piece that broke off is only 1 tooth.

i tried to see a dentist soon after to see about the cost to replace it but i had a very bad experience and my insurance does not allow me to choose my dentist, my dentist is assigned to me.

is it safe for me to keep using this retainer for now if only one tooth snapped off? i feel like i feel more sensitivity on the left side of my mouth where the retainer is whole. i’m not sure if this is because of the break or maybe just because i stopped wearing it for a bit when it initially broke.

i have a lot of anxiety surrounding my teeth so i hope i haven’t done any damage by continuing to use it.