Feeling guilty for leaving work..?

So I had to leave work today because I felt like I was going to faint. I don't go home often, and I only knew for sure that it was a fainting feeling because I have fainted before (low blood sugar about 4 years ago. No fun) I was going back and forth between feeling faint and feeling like I was going to throw up. I made it home and fell asleep on my bathroom floor for like 4 hours.