Best wishes and good luck! Here are some collections that might help:
Mobility, Recovery, Physical Therapy: https://grokker.com/yoga/collection/mobility-recovery-physical-therapy/603eb9efb356ab7d31b83fa0
Qigong and Taoflow: https://grokker.com/yoga/collection/qigong-and-taoflow/603ea838b356ab7d31b81cf2
Pilates: https://grokker.com/fitness/collection/pilates/605edf53c1a5914c330396b3
Meditations, Yin, Pranayama: https://grokker.com/mind/collection/meditations-yin-pranayama/603a8adab356ab7d31b44f1e
Gentle Yoga: https://grokker.com/yoga/collection/gentle-yoga/603f6d0ab356ab7d31b8bc7a
Yoga with Adriene Mishler: https://grokker.com/fitness/collection/yoga-with-adriene-mishler/6009c7453fa6704a3439b548
Flow Yoga: Beginner-Intermediate https://grokker.com/yoga/collection/flow-yoga-beginner-intermediate/60ce43f84cb7214269a7ea13

You can find some videos in Kevin Fong's program for back pain relief.
https://grokker.com/fitness/pain-relief-fitness/program/pain-relief-with-dr-kevin-fong/5f86107071167517fc6d2bc6