So sorry to hear you have to deal with this deranged person, along with your ill health... It always seems the case that departmental heads are cowards and do not intervene .I would block her email address - she is not worth a minute more of your time!

On a personal note, I developed asthma when working full-time, plus doing Masters, plus having family putting me under huge emotional stress, plus a boyfriend who was very jealous and unstable emotionally... Utterly exhausted adn under strain, my breathing was affected....

I got my health back by kicking all the leeches off my energy, out of my life. It took some doing, over a period of years, but my days are now far more calm and peaceful and I have not had a cold in over 3 years. The key change has been controlling who has access to my space, time and energy.

I decided to prioritise my health, as my No1 concern. The wrong sort of people, bring us a lot of suffering, that's for sure.