Computer use is a real pain

And I'm not talking figuratively. I use the computer a lot. All day long at the office and many hours in the evening for entertainment. I have developed tendonitis that messes with my wrists, but that's pretty much mitigated now. I have learned how to hold my hands and such that I'm not causing myself to aggravate that pain. However, recently I've developed some sharp pains at the top of my forearm. Just on the interior of the arm, below the bicep, but right at the top of the forearm. It can be pretty harsh. My question to y'all is, have you experienced anything like this? It's almost like I tried to curl too much weight and have pulled/torn a muscle.