I recently got some sort of arm injury and I don't know what it is. It's not bad, but what bothers me is that everytime I play my arm is like really stiff so I can't really move it that well or trill really well. It's also everytime I type on the keyboard, or literally anything actually. I guess it kind of tenses up aswell. I took a break for 2 weeks but it's still the same, probably even worse than before. What do I do?