Hi LizeeeH,
Definitely sounds like we have the same thing, mine is also mainly my right hand(I am right handed) but pretty sure it is a menopausal symptom as it went away when I was on HRT! Just seems to be a rarer symptom, but it is listed in 34 symptoms of the menopause. Just wish I could find a cure or a way to relieve it, even my GP wasn't aware of it. Let me know if you find an answer!!