Jay
Cock Diesel
These could be nerve issues, physical damage or just general weakness due to lack of training.
Agreed. It definitely needs tests.
Could also be nothing at all after 5 years and just be a mental issue. I can understand wanting to put stress on your body and lift heavy, but have that niggling worry in the back of your mind that something (knee, shoulder, heart, etc.) is going to give out.
Even if that's not going to happen, it can be grossly limiting.
I hope you figure it out man