Had CFS since June 2015 following shingles and glandular fever. is a permanent headache for 18 months at the back of my head, and throughout the day going to the top of my head and the sides of my head but always going back to the back of my head, normal in CFS? This is also accompanied by head pressure/brain fog (it used to be mushy but now it just feels like extreme pressure). I don't know any remedies for this - general headache medication doesn't touch it and I wonder if it's because it's being caused by an ongoing viral infection. This is my worst symptom and i don't know how I can go about treating it? Would anti virals help? Any suggestions?