Could it be triggerpoints causing some of those feelings?
When my sx show up forearms are the usual place, aside from the achy neck/shoulders stuff.
My forearms are lumpy & bumpy when I rub my hand slowly over the muscles, top is worse- knotty /ropey the PTs called them.
A little bit all the time but worse when I use them repetitively and when neck gets tight.
Been fixing my puter
all day today so arms are starting to complain.
means extra home therapy time tomorrow.