Ouch! By "stuck", do you mean it has the sense of freezing up and you can't move properly? Constant pain? Out of commission until you see the physiotherapist?
It seems to me that with all the investments you've had to make in phsyiotherapists, you should have an arsenal of muscle balancing exercises and stretches that you could put together in a schedule for home. Yes?
What may well be happening is that habituated movement patterns are keeping the situation persistent. Along with chronic inflammation and acute attacks - well, there you have it.
I've had many many nurses as students and clients and back problems have emerged as an occupational hazard - sometimes serious. Extreme care needs to be taken when reaching and lifting, but I know you already know that. The thing is, it can become imperative to pay attention to it. The "age" thing is partly because we've done something so long that it's become chronic - like moving in a certain way.
So, in concert with whatever physical therapy exercise your physio can give you, a focus on posture and alignment would be extremely beneficial to you. It can make the difference between perpetuation injury and practicing patterns of movement throughout the day that are not inflaming the problem. Correct anatomical alignment means you walk with your feet straight ahead (most of us turn out at toes, the knees collapse in, the tail goes out, the back gets stressed - and then we lift things on top if it!). Shoulders stacked over hips with chest open.
An excellent course of study for posture is the T-Tapp Wellness Workout here: [url=Flag this messagehttp://www.t-tapp.com/affiliate/idevaff ... php?id=107
]T-Tapp Wellness[/url]. The Basic Workout Plus program would be a great place to start. You could also undertake study of Alexander Technique to assist with good functional movement patterns. It's important to carry the lessons beyond a workout, and to integrate into movement throughout the day so that we don't sink into old movement patterns, perpetuating problems.
Good news that there is no deterioration! The inflammation is giving discomfort, and may demand a period of rest from whatever is the most offending activity.