It sounds to me that DB and your lodger have a great relationship. Not only are they, in different ways, working together to support you but they can have honest discussions with each other. I hope that DB can keep an eye on Mr Creepy - Wide-O's suggestion of him driving her to her work is a good one.
The is excellent that your haemoglobin and infection are improving

. That is awful about how the female RMO is being treated - sadly, male medicos still have a lot to learn.