Hi justin, your symptoms sound familiar. Here's my story.
Last may, I started working from home a lot more (on my laptop).
In july, I came down with a cold and stopped exercising for a while to make sure I got better. The work days got pretty long since I wasn't breaking them up. After a while, I began to develop a pressure sensation in my left temple. Doc assumed sinus infection and put me on meds.
Symptoms got better, then worse. Pressure started to develop around left eye also. More meds. Cycle continued.
In october, it seemed to get even worse...Pain behind each eye, occasional light-headedness/dizziness, fatigued, no motiviation. Starting to worry.
By december, I had been to a neurologist, had mris and cts of everything above my waist, checked my lymph nodes, full blood work. They could find absolutely nothing wrong with me.
In late december, I started to feel better. In fact, I felt great until about mid-february when the symptoms started to return. Dizzy when standing, achey neck, discomfort around eyes.
Looking at it now, it all fits. Working from home began a cycle of long days sitting in the same position at my laptop with my shoulders hunched staring down at my screen. I got "better" in december because I was forced to break the cycle...Got the flu, christmas break, week in vegas. I got back into my workout cycle and felt awesome. In feb, I got a cold again and went back to the long days in the same position...The symptoms returned.
I still need to fix what's causing the problem, but knowing what it probably is has me very relieved. My posture sucks, I sleep on my stomach with my neck in a bad position, my eyes strain to see my monitor...Everything on the bad list.