Feeling nervous at 21 weeks pregnant

A

I have had one healthy full term pregnancy and 2 previous miscarriages. So I get pretty anxious when I experience out of the ordinary symptoms. I would like to know if anyone has ever experienced the same...

I was sitting down barely started eating my lunch when all of a sudden I felt like I was going to faint. I then lost my vision, everything went dark. I then got very weak, short of breath and nauseated. I was finally able to get up and move myself to the sofa to lay down and try to catch my breath.

This is not the first time feeling faint but it is the worst experience so far. I was not doing anything out of the ordinary before this incident. and I do not have high blood pressure. I Googled symptoms and preeclampsia is the only thing that comes up.

Should I go to the doctors? Or just wait it out? Has anyone else experienced this?