Story time and wanting your input.

My husbands good rope horse had an episode this weekend after a rodeo and had to make an emergency trip to the vet. She wanted to lay down and roll after getting hot/nervous and not able to cool down. First thought was colic. So after rushing her to the vet, an ultrasound and palpation did not find any impaction. They went ahead and oiled her and gave her banamine. The vet suggested ulcers may have caused her extreme discomfort. 

On the way home she fought the trailer. Slamming, pawing and trying to lay down again. After she got home and turned out..it was as if she had fire ants all over her. She would lay down and roll...jump up..run....back down to roll. Usually a colicing horse will lay and stay. She was trying to get away from whatever was hurting her. She was fine by the next morning. Planning another vet visit to get a treatment plan together. A friend of my husbands seems to think she was tying up, as he had one with similar behavior. 

Some info about her: Shes 18 (never had an episode like this in her life that we know of) 

She is straight cow bred. Sired by Pop A Top Pep... I cannot recall her bottom side at the moment. 

It kind of sounds like what my 25 year old gelding does periodically.  He will lay down roll a bit jump up and then start trotting in circles.  When I catch him his skin twitches just like he has something biting him.  Sometimes he gets muscle spasms in his flank/rib area.  I put my magnetic blanket on him and give him a dose of Kolik Eaz that I get from Silverliningherbs and he comes out of it.  I check his gut sounds and he has always had good gut sounds but it worries me and I wonder if he has any eposides when I am not around.  He poops and drinks good.  I also have him on a magnesium supplement and it seems to help.  Also seems he does it when weather changes.  I also give him a scoop of electrolites every now and then to keep him drinking.

When I was working for a cutter years ago in texas we had several that were prone to tying up, but they were unable to move. Their muscles got hard, twitched and were unable or super reluctant to walk. If one is tying up it's generally very painful to move. My money would be more on gastric issues than tying up in your case 

Ditto.

She could've just had a bout of colic. I've used Kolic Ease (Silver Lining Herbs) with great success. I would get her checked by a vet.

A tying up horse will refuse to move.  

A friend just had a horse do the same thing.  It was tying up.  What are you feeding?

I have had horses tie up and they refuse to move, quiver, sweat. I usually give banamine plus a sedative to calm their mind and body so that they relax. I recently had my good young gelding act a little bit colicky and he was acting scared of himself like your horse was, Not to that extreme but it was definitely noticeable.