At the time of writing this I am a few hours away from having a cortisone injection in my left shoulder. The swelling from last year finally started to reduce a few weeks ago, and has nearly gone. The constant pain from the left shoulder, to back of the left shoulder blade, and then up my neck has only reduced a little bit. Although doing more than nothing still quickly increases this pain.
I received whiplash a few weeks ago during an emergency brake, even though it was not a particularly dramatic incident. It just shows how susceptible a person with a weakness is to injury.
My current sick-note is due to expire next Monday. It is hard to estimate whether the cortisone injection will give such a rapid improvement in 6 days, but hopefully it will.
I expect the injection to hurt, and whilst it may not help, I think it is worth trying at this stage. A few weeks ago I read a few articles and research papers on the subject, for example: http://overhaultraining.com/cortisone-injections/
One of the things I kept reading was how key physiotherapy is, regardless of having cortisone or not. Since I desperately want to be able to exercise again, partly because I miss Brazilian Jiu Jitsu, and partly because I have put quite a lot of weight on, the sooner I can start exercising a lot more the better. I have been doing some very simple exercises, small shoulder and neck movements, as well as short works of a mile or two. However, I was advised by three doctors that doing more than this currently is not advised.
The trouble is determining when can I start to do more? Sensibly a few more weeks of basic movement is what I should stick to, and at the moment I am considering re-joining a local gym to get access to the swimming pool, sauna and spa. I am aware it is better to be sensible then do too much and quickly aggravate the injured area again.