You can read up on the injection here, it doesn't seem to have any side effects other than possible local ones? www.nationalmigrainecentre.org.uk/migraine-and-headaches/migraine-and-headache-factsheets/greater-occipital-nerve-block/
Estranged Son and Future Granddaughter
To think that London, or anywhere else for that matter, does not belong to any one demographic