I Have Been Feeling Dizzy And Have Been Seeing Spots

I have been feeling dizzy and have been seeing spots now for about a week. At work today one of the nurses I work with pricked my finger to check my sugar it was 209 and that was about 3 hours after I ate. Should I see a doctor right away? I'm not sure what to do I'm still lightheaded and so so tired. Please let me know what to do and how bad this is. Thanks!