I Have Been Experiencing Periods Of Lightheadedness, Some Blurry Vision,

I have been experiencing periods of lightheadedness, some blurry vision, lack of appetite, fatigue and thirst since Tuesday. I went to the doctor on Thursday because I felt quite sick. I went to a urgent care clinic because I could not get an appt and my regular doctor. They did urine analysis but my pee was almost clear due to the fact I was drinking water non stop because I was so thirsty. The drew blood and did a few tests which were all normal except AGAP which was 20. My glucose was 85 and I had not eaten in about 7 hours. The doctor just said to see my doctor if it continued. Friday I felt the same way, went to bed early and woke up at 9:30am. I felt better this weekend but when I got to work today I started feeling lightheaded again. Should I see my doctor or maybe I am just still tired?
Thank you