Nidge, great advice already from others in addition
you might want to think about your workplace comfort, is your current chair adjustable in height and tilt, does it have arms and maybe a head rest that if you need to just sit back for a while you can.
In my old workplace we used to joke that a chair with arms meant junior management, one with a full headrest and padded arms etc meant senior management and the laether one with super padding, a whole width shoulder and head rest and a slot for the coffee mug was the Boss's chair.!!
Fexibility to pop out and take some air if you need it withut someone asking why, and only as much info shared with your workmates as you are happy to deal with. Your employees sound like they are top banana so your confidentiality will be paramount along with your well being. You are a loyal and hard working person so they will do all they can to look after you, they obviously want you there for the long term which is so good to hear.
love hearing about employers like this
xx
Mo