Random pain in tailbone

Shannon

Alright so ever since I can remember, I gets these very very horrible pains in my tailbone and actually also make my anus (asshole) hurt as well. It only ever happens when I lay down. And it’s not all the time. It’s maybe like 1-4 times a year that it happens. But when it does, the pain lasts forever and it’s very unbearable. Has this happened to anyone else? And if so, what causes it?