Has this ever happened to you?

Hi everyone. Today I was sitting at work when all of a sudden I was short of breath, had blurred vision, was nauseous, and got really hot. I had no idea what was happening to me. I was super worried about it being preeclampsia. So my husband drove me home (we work at the same place) and i called the nurse. The nurse told me to eat a big meal and drink a lot of water and lay down. Ever since then ive had a headache all day but the rest of the symptoms have generally subsided.

I haven’t had high blood pressure at all during my pregnancy and I have not noticed any unordinary swelling. Do any of you know what could’ve caused this or have you experienced the same thing? I had breakfast like usual before work and I drink a ton of water so I really doubt it was my blood sugar or dehydration. The thing that scared me the most was the blurred vision. It felt like I couldn’t see for a few minutes and that made me panic more.