Hi Rachael,
Will try to keep this short, as it's a bad typing day for me today. Ditto for me - the hands and forearms have always been the worst (my Tos is also from RSI, like yours). When i was working, also had a "worn out elbow" feeling, but never the terrible stabbing neck and shoulder pain some get. Do get the constantly tight neck and upper back muscles and the (fortunately only occasional) headache that goes with it but for me it is minor nagging, not disabling as the hand and arm pain is. As for weather, humid, sticky days flare me up more so than rainy days. Hope that helps.

Hugs,
Nolina