Feeling faint/passing out

Anyone else feeling faint or actually pass out? I'm 16 weeks and have gotten this feeling a couple times now where I get really flushed, disoriented, feel like my arms aren't working properly/weighed down, and like I'm moving in slow motion. I've never actually fainted before, but I can imagine this is what it might feel like just before. Anyone else? Tips on what to do? Is this normal? I ate some food and drank water right after, but still felt bad for a while.