Waist support (also helps with dysautonomia): www.amazon.com/dp/B01N2YVYCU

SI stabilization belt: www.amazon.com/dp/B000NIFVM6

Soft neck collar (also helps with sleep on a plane): www.amazon.com/dp/B01N0XNAD5/

Any sort of pillow for the small of your back (a wadded up blanket does the same): www.amazon.com/dp/B00HANX2VO/

An all purpose neck/low back/other pillow I’ve always loved: www.amazon.com/dp/B0006MQC90

Also, roll out a lot when you arrive. One of my favorites is using this type of device from sacrum to neck, multiple times a day. It helps get everything aligned again: www.amazon.com/dp/B01M3PTP1C