I'm at 8 weeks and having awful morning sickness. I just fainted.. I don't know why. Is that normal?

I've been having awful headaches and nausea all day. Can't bring myself to eat dinner... Was walking back from a pee break when I had a bout of intense dizziness. I was hearing loud noises (like a train passing by), shaking and drooling and suddenly I was lying down. My husband was with me and said I passed out for a few seconds and bumped my head on the cabinet. I don't remember that. Should I go to a doctor? Has anyone had similar experiences? I did manage to eat a bit of breakfast and lunch so I don't have an empty stomach but it's been ~6 hours since my last meal. #pleasehelp #1stimemom #advicepls #firstpregnancy