Hello there I suffer from this a lot even more so when the anxiousness is high, mention it to your healthcare provider.
I have also got epilepsy and this happens sometimes before a seizure.
I have generalised anxiety with psychotic issues but also disassociation.
Of course no one can suggest to you or diagnose you here only your T or Dr can do this so do tell them.
It can be quite alarming when it happens but I'm so used to it now.
There's always someone on here who can relate to your concerns that's why I often turn to this forum in times of need, however these good people are not professionals.
Feel free to discuss this to me further if you need
Take care
J