I am a double board certified US doctor and will help you with this.
this can be a transient stroke.
It would not show up on a CT.
You need doppler imaging of the carotid arteries and the heart.
It can also be progressing lower spine disease.
Get a doctor who will test all of this. The lower spine would need an MRI.
If this recurs, go back to the ER and ask for these tests.
Or do that now.
OK, so you might have more questions or want to give me more information: Please use reply to expert if you have further questions. Also, please click a positive rating [hopefully excellent (5)—that’s how we are paid, per rating]. If you forgot something, just use reply and come back. I am here