You are having

When are nebulisers used?

Nebulisers are used to give high doses of medicine:

1. in an emergency when you’re having an asthma attack in an ambulance or in hospital
2. when you’re being given certain tests to diagnose or rule out asthma
3. if you have a diagnosis of severe asthma and your asthma specialist has prescribed you a nebuliser to use at home

On this page you can find out about getting emergency treatment through a nebuliser.

https://www.asthma.org.uk/advice/nhs-care/emergency-asthma-care/nebulisers/

please explain the use of present progressive in "you are having an asthma attack..." and "you being given"?