I have had 147 views of this post and no responses...perhaps no one has this side effect..

I am happy to report I got to the bottom of this..
This is my new normal. .6 lymphocyte count is not normal. i do have to keep close watch on this. particularly when ill ...It took a 2nd oncologist to acknowledge this is probably the side -effects of chemotherapy / radiation.
google cisplatin( my chemo drug) and lymphopenia..there is a co-relation.

I have had many nasal/ ora infections in 5 years and now face a previous root canal / bridge that has become infected.
Hopefully a retreatment of the root canal will work ...an extraction I will avoid at all costs given the risk.

I am hoping this information someone finds helpful one day.