Greetings, I'm In My Mid 40s And I'm Having A

Greetings, I'm in my mid 40s and I'm having a lot of pain on my tailbone when I'm laying down in bed, sitting in an office chair or even when I wear some pants. I've used a heating pad at times, but I can only be on my back for short periods of time before I have to turn on my side. Please advise.