Sorry things are feeling so horrible right now.

I don't know if it will help you but a couple of things that used to stop our spinning were picking up a small object and focusing on it very intently (feeling it, turning it, looking at it) and counting objects in the room. Counting (can be any real objects around you) uses a different part of the brain and has helped us ground many times.
The holding an object thing seemed to work best for spinning tho.

oh, just thought of something else: backing right away from the trigger (sounds like for you right now it is the memory that has been redissociated) helped the process stop more quickly. not allowing us to think of the memory or the loss of it or the system or the protection or anything connected to it at all helped us. it slowed the spinning til it stopped, and then once grounded we could tackle the material from another angle (very carefully, so as not to set it off again!)

dunno if any of this helps, but they are things that helped us.