During Work I Got Very Light Headed And Broke Out

During work I got very light headed and broke out into a sweat. I had a healthy breakfast so I am not sure if it was my glucose levels which I have never had an issue with. I also felt very weak as well and could barely stand. May I have your insight please?
I am a known anemic which I am seeing a Hematologist for. I have had labwork done in the month of December . However, everything came back great. I do not want to keep going to the clinic and they keep not finding anything but I feel ill daily. Any suggestions?