Hand cramps and other knitting injuries

I have been knitting a lot lately. If my hands are not busy typing, doing dishes or sleeping, they are probably knitting. This has gotten me some pretty strange sensations in my forearms and hands.
I have had weird pinching pain near the inside of my elbows if I knit with large needles for too long. I get hot, burning pain near my pinky and ring fingers if I knit with small needles for a while.
I also get cramps from the elbows to the tips of my fingers if I knit too long, period.
The only remedy I have for this is to take frequent breaks and change what I am doing often. It is not uncommon for me to have two or three knitting projects on the go at once, all on different sized needles. I will knit 10 or so rows on one project, then take a break. I will then clench and unclench my hands a few times before picking up a different project.
I really don't know of any other options.
Do you get this sort of pain? What do you do to fix it?

Busy busy!

I haven not been updating, once again. This time, it's for a few reasons.
I have been cranking out kids hats off of the knifty knitter. I've been working on some scarves. Finished a couple dishcloths. I have been very productive.
But. My wrists have been hurting. There is no denying that it is knitting related. Even if it's not, it is definitely being aggravated by it.
I've been trying to stretch my wrists often. And I've been taking a ton of breaks, but they still hurt.
I am going to try to take it easy with typing, knitting, and other such things for a few days and see if that helps at all.