When my GP ran bloodwork for me, similar complaint, nothing came back, so he said it could be MS, related.

I was having them, at work, and especially in the shower at home. I was lucky, one day, to not have completely fainted in the shower, but was able to go lay down for a while.

Haven't had an episode of this, in a while. I'm not shrugging off the possibility of stress or not drinking enough water, well not, not eating, but perhaps due to the time of day, not having enough food in my system.
I am not shrugging off stress, because since my promotion, and change of venue, this hasn't happened to me.

And I am also not shrugging off, MS, because this illness, is just one of those illnesses that no one seems to know. It could be, is the usual statement.

Hope you are feeling better.