Rotator cuff injuries cause pain in your shoulder and upper arm. The pain may be most noticeable when you reach up or out. When you turn your arm as you lift it, the tendons are more likely to rub against surrounding structures.
The essential difference between the original series of AF Nikkor lenses and all AF lens types introduced subsequently, from the AF-D versions onwards (see below), concerns the compatibility of a particular lens with Nikon's enhanced Matrix metering system known as 3D Matrix metering that was introduced during 1996.
In short, you'd probably be better off selling your Canon lenses and purchasing Nikon lenses for your D3200. But if you have to use these lenses, then get a Canon EOS dSLR body to match your glass if it's EOS, or get a mirrorless camera body and an adapter if they're Canon FD/FL. I believe that is the one you can't do. One of the big two mounts their lenses too far from the sensor to use the other's lens system. I don't recall for sure which it is, but as there is an adapter to use Nikon lenses on an EOS body on B&H, presumably it is the Canon lenses that can't work on a Nikon body.