Have you looked into trying Myofascial release therapy or MFR? I too have had trouble standing or sitting for more than 5-10 minutes before my feet start to burn. Since I’ve been having MFR therapy, I have been able to do much more , still have some pain but is tolerable enough to enjoy life. I too was very active but a fall and 5 back surgeries, including a spinal fusion, a Neuro stimulator, and many more alternative options gave me no hope until I found the benefits of MFR. It’s a specialized form of PT, so if you do pursue, be careful to make sure the therapist has had the special training.
Good luck and hope things improve your quality of life !