Posted the above links to help out with testing etc.
I have had cfs/me now for 11 yrs after 3 infections(cmv/ebv/chickenpox) within probably 6 months and i fit into a subgroup of cfs/me that respond to treating herpes infections.
My initial couple of years i could exercise quite well with relapse or crashes as i call them and then recover again and this cycle repeated itself a few times until it became more constant.
I have improved using antivirals meds, immune modulators as well as doing adrenal fatigue treatments.
It can be hard to treat these conditions as you are finding out.
I also have chronic sinusitis, my doc says that staph infections are very common causes of chronic sinusitis in cfs/me. I have been unable to cure sinusitis but doxycycline has helped alot. It can be hard sometimes to pick up that its sinusitis doing these things as many think it presents like a cold. For me sinusitis worsens sleep and i wake very early mornings with bad headaches, probably because of poor sinus drainage lying down, also get very dry eyes, and post nasal drip which is really annoying and the fatigue can drop me as bad as my cfs/me symptoms prior to antivirals. Worth looking into for sure or a trial of doxycycline for a few weeks.
Immunovor which is an immune modulator helps improve immune function and natural killer cells which could also be helpful for sinus infections.
good luck mate,