Walking problems and joint pain

Hi. My husband has been suffering for 10 years with joint pain starting at first with his back then knees, shoulder and by far the worse, an odd walking gait meaning that his ability to walk without thinking about it is few and far between.  He has had multiple surgeries over the years and last year suffered a complete mental breakdown, at this point he was diagnosed privately. 

When I first met my husband he had a REALLY bouncy walk and would walk around on his toes at home, this over recent years has reduced and been replaced with this awkward and painful walk (it's as if one leg wants to bounce and the other doesn't at times). He's seen physio etc and is simply plied now with opioids which he takes with great reluctance as this impacts on his mental health. 

Last night it clicked that as his bouncy walk has decreased the painful awkward walk has increased and so I researched links between asd mobility issues and there seems to be a lot of American research supporting my thought. My question is, is there any help in the UK? He feels very alone in his problem and he baffles all he sees. Is there any support out there for him? All he wants to do is walk without thinking but it's almost an obsession, his imbalance and walking gate. He's so commited to doing the exercises he gets advised to do so it's not a lack of effort to improve. He has seen anatomy in motion experts and still nothing sticks long term. 

Help!?!?!?!