yes i do get this primarily first thing in the morning when i get up & start moving around & if i over do it with walking too much etc.

i have tried stretching, but this doesn't really seem to help much although i keep doing it anyway. i also try cold packs (because my body can't handle any heat) massage sometimes seems to make it worse. i'm at a loss too... not sure what would be best at this point.

yes i am the same - at a loss - cannot handle heat ( hydrotherapy in heated pool fatigued me so much they thought it was MS) I get it in the morning too & can't keep sleeping or keep still. Levek mentioned epsom salt baths on another post and will try this soon. good luck.
my story is at http://notmydisease.blogspot.com/2010/05/finally-diagnosed-with-myositis.html
if you are interested

My doctor told me it is a sign of low potassium. Try ramping up your potassium and see if that helps.

Yes - I do get this and have had this for years. However, it has gotten worse/been happening in a different place/way for the last several months (upper/outer thigh/hip areas).

Last summer I went to the hot tub everyday because I thought it would help with pain and stiffness, but I figured out that it made made me weaker and made for more inflammation when winter came and I stopped going.

I haven't yet figured out what to do for it. I do know that I can't sit or stand for too long in one position when this is going on.

Potassium helps, as well as hydration. Also, make sure to keep to a schedule of stretching so as to keep the muscles from atrophy...