Ok, results. I have read people with cervical issues have flare ups, post the exercise if it didn't work out, some 24 hours later and then it worsens or betters or just tapers off.

In my case, I did a lot of strong (in other words, wrong) isometric exercises for my left. I think it was a mixture of impatience and generally "do something" attitude.

So I had a flare up which lasted for 2-3 days. Shoulder pain and worsened symptoms.

After that, I do feel things improved. Not by much, but yes improvement. How I judged this? Movement in a moving vehicle, usually I would find it hard to sit straight - that worked.

Its not a magic cure all, but it does help positively.

Next step, regular isometrics with lower strength.

One big issue I am struggling with is whether to do an exercise program and go for a MRI/xrays to determine cervical instability.

If the exercises are marginally successful, they would bias the test results.

And cloud the diagnosis.