I get the same thing but its more when I stand up or bend down.
I thought it was blood pressure but I bought a bp cuff and everything is ok there.
Then I noticed it when I've had caffiene.
I've mentioned it to my docs but they don't seem to be too concerned.

I've had a lot of strange things happen since my MS.
My husband is so used to me saying "Oooo dizzy, gonna pass out......okay its gone" He doesn't even stop to ask me if I'm alright!
I call it "light headed" because to me its not quite a "dizzy"
My vision can even black out for just a second when I feel a bad one.
Also don't underestimate what low blood sugar can do.