Difficult to breathe anyone?

Does anyone find it difficult to breathe at times? Not from the lungs but, it seems, from weak and tight muscles everywhere including arms and legs but mostly throughout the torso from stiff and painful stomach, abdominal, thoracic, chest and shoulder and neck muscles all seizing up at the same time?

I keep getting this but I'm not sure if it's a prednisone problem or not because it started getting pretty bad about a year or so before I began taking it. I kept telling my wife that I feel awful like I'm going to stop breathing altogether as nothing muscle-wise wants to work easily. It's like the smooth and easy coordination between adjacent muscles groups are fighting against each other and they all seize up or lock up which is painful and makes every tiny movement very hard. Then I feel like all my muscles are contracting really tightly, even those that allow me to breathe easily.

I've had a run of nights when I'm trying to get to sleep and just can't find a comfortable position which allows me to breathe deeply whether I'm on my back, sides or on my stomach which, if anything, is where I feel I can at least breathe a little better for a while. My wife 'notices that too. But, I keep on having to get up to walk around and try to stretch my back, thorax, neck and shoulders out trying to undo the tightness everywhere so that I can find a way back to taking a full breath. It can take a couple of hours sometimes before all of a sudden things seem to unlock themselves and I can breathe a lot better. Unfortunately, it's not long before it all seizes up again. It's driving me mad trying to find a way to stop it from kicking in.

I'm not sure if it's coming from my spinal column or possibly the thoracic spine area which often gives me weird problems.