Well, next turned out to be:
I have a severe and rare skin disease. Fecking marvellous. Nodular Prurigo. Don't look it up, the pictures are revolting.
And I started off with a fungal infection in the 80s (thanks to Chinese rope slippers), which caused Eczema, then Psoriasis, then good old fashioned Scabies (caught off a patient).
Constant pain and itching. Haven't slept properly for months.
I blame useless right wing governments.