I Am Currently Traveling For Work. Prior To Leaving Yesterday

I am currently traveling for work. Prior to leaving yesterday I spent the weekend to fatigued to Christmas shop, decorate, attend functions. I tried but often found myself sleeping in the back seat of our car while my family participated in events. I felt better Monday after taking some left over augmentin, but then was severly fatiqued after a short plane flight yesterday and slept for 18 hours in my hotel. I am about to fly home later this evening but am having trouble staying awake waiting for my flight. I have never been so tired and my neck and head hut and by body is stiff? Thoughts?