Got an appointment with the doc !
Bear in mind that I live on a small Spanish Island and although the facilities are pretty good, this kind of thing may well be outwith their remit.
Although my chest area feels a bit better than it did, there is still a "heavy" slightly hot sensation.
The coating on the blade was very "glass like" and sanded off as an almost invisible powder rather than fibres. I only sanded about 80% of one side.
We shall see !
El G.