You might consider making your workstation more ergonomic.
I use a sit-to-stand desk, so that I can stand at the computer for a few hours a day. It makes a big difference. If you do this, you will need monitor arms to change the height of the monitors as needed between sitting and standing. I have also found the Kinesis Contoured Pro keyboard helpful as well as a saddle chair.
The key -- is to change positions throughout the day.

Where do your arms burn? Is it just the forearms ? Or the whole arm?