Hi Pls Allow Me To Thank U First For This

Hi pls allow me to thank u first for this opportunity:)
I'm 50 years old i have lower back pain that badly effecting my legs i can't walk without limping
Test shows three wear discs and nerve inflamed and bad hips !
What exercise is the best for me ? I do swimming and hydro therapy every other day ! I can't go for a walk ! It's so difficult!
What is ur advice ? Stretching? How this can help it's very painful?
Thanku