I like the chocolate advice myself!!!

Seriously, you may be deficient in some area. Maybe an appointment with a dietitian would do you good.

Except for the coke a day, I think you are doing really good on your eating!

Maybe the weather is affecting you like Ewi said.

Have you had a physical with the PCP lately? All the bloodwork? Maybe it's time for a checkup....

Meanwhile, work on that last coke! Switch it for some chocolate - dark! Serious!