Hello and welcome from me as well.

I feel your pain! Oh my how I feel it!

I've fractured my coccynx once and fractured my sacrum (above the coccynx) twice, so there have been extended lengths of time where I either could not sit down at all, or had to carry a cushion everywhere I went. I still have a special cushion in the chair I spend most time in at home, otherwise my tail suffers and so do I.

Have a look around the site, I'm sure you'll find others like you and I.