I'm sorry you are having to deal with this Vrae. I get this "stuck" feeling often...usually in my hands but have also gotten it a few times in my leg too. Lately in my hands I can actually see sometimes when the muscles spasm and then get stuck in that my hand actually starts to look deformed the way the muscles have contracted. It's incredibly painful but the only thing to do about it is to massage it out and forcibly move things back to their original position. There have been times when BOTH hands froze up...and then I had to have my boyfriend force them back into a normal position. Hurt SO bad and was an awful experience for both of us...but is better in the end than the alternative of just leaving them like that which is also excruciatingly painful (as I'm sure you know).
Following the massage and repositioning...a hot bath in Epsom salts is helpful. Doesn't really work with my hands but when I've had it in my leg...ultrasound heat therapy helps as well following a bath. I got my portable unit on amazon for about $40 and it was definitely worth it.
I have found that there are certain movements I need to try and avoid because they always result in this sort of reaction. Holding things a certain way...stretching a certain way...whatever it might be. Once I can pinpoint what causes it...I try to avoid those things as much as possible or try to find some way to mitigate the situation (flexing my hands constantly, changing positions quickly, etc).
Wish I had more to offer you...but I do understand. My boyfriend tells me to eat more bananas. I've done this...but it doesn't seem to make any difference...lol! Oh well...at least they are good for me.