Help Diagnose Muscle Pain?

[Desp]

When lifting weights, doing any type of static holds produces the most pain, which is not manifested until after the exercise has been completed.

So when doing squats, I'm pushing the bar into my back (not holding the bar with my arms), my back is holding all of the weight, but since I'm keeping the muscles tight in my arms after the exercise is over and I start to cool down the pain starts coming on. It feels like a dull deep pain all throughout the muscles. Completely different than a muscle burn of DOM, it's extremely painful and gets worse for a period of time, usually an hour or two, then goes away and feels fine unless I do another exercise of similar fashion.

Another type of exercise which would cause the same pain is rock climbing, holding onto a hold, or pulling myself up and holding that position will cause the onset of the pain. Interestingly enough it does not start hurting until after the exercise is over and I start to cool down. If it starts to hurt, and I restart the exercise the pain goes away, but once I cool down it will come back angrier than before.

I thought it could be tendonitis at first, but after more research it appears that is an inflammation of the tendon, usually occurring around the elbow. That's not the case with this.

It seems Tendinosis is a more likely culprit, after further research it seems to be much more common and more often misdiagnosed. Although I'm not sure if tendinosis is the cause as the pain permeates throughout the muscle, almost feels like it could be in the bone.

All I know is it sucks, I'm going to have to stop working out if I can't find what the issue is, or what I can do to correct it.

Suggestions would be appreciated.