I'm not sure I'd like to try antivirals completely blind without any indications either, but didn't you say you have high (or highish) IgG, IgA and lymphocytes? That is much more solid that NK cell function tests. High lymphocytes with neutropenia is very strange. What level or range of levels are your IgG, IgA and Lymphocytes out of curiosity. A long time ago (1990's) Professor Komaroff found a subset of CFS/ME patients with high total IgG (15 - 20). It is a pity those patients weren't followed up as a subset. Also, have you ever had your ferritin and transferrin saturation done?