Sounds like labyrythitis, but the history of trauma and hypertension (along with smoking etc) can’t rule out CVA/TIA or some other kind of haemhorhage.
“non emergency paramedic” Is probably and ECP or Paramedic Practicioner, essentially a paramedic with advanced training and skills who is in theory in a better position to treat at home or refer back to GP etc. They also respond to emergencies as appropriate.
“white coat syndrome” is a common cause of increased BP, and BP is just a number when taken once during an incident.
Although ECP’s/PP’s have been around for a while I can see more and more staff (particuarly on cars) being trained to this level to keep people out of hospital where appropriate.
Hope MiL feels better soon!