My allergists says it’s likely “histamine flares”! He wants me to take Zyrtec when the episodes happen but he might put me on it every day. I see him again in 3 months. We talked for a hour straight! The mono test shows past mono not current mono! So I dunno if I caught it from when my friend had it last fall and didn’t show symptoms or way back in 1990 when my sister had it?