Benign paroxysmal positional vertigo (BPPV)
The insignificant nobody me is not a medical doctor, & thus only a professional doctor can assist you on the medication & steps that you alone can help to alleviate your situation based upon your own free will & diet choices...
All I can do to help is to share knowledge over health matters based upon experiences, with another fellow citizen, although in truth, I had never experienced such before, except during military life where some missions were to be completed, at all costs, although in reflection, it could had been better managed than to micro-manage every single detail, to learn to trust & delegate tasks to others, share workloads & common goals to achieve objectives, with better health & operations issues for all....
The Human body has an unique immune system, to protect the Human body & often only works effectively when one is at rest. It may be due to stress, often with work that keeps the MIND from full rest as one is using the body's other system to process thoughts & thus our immune system will not work effectively.
Also & equally, a BALANCE is needed to keep our immune system fully optimal - moderate exercises to burn off unnecessary fats, enough sleep & a healthy diet such as moderation in protein intake - white meats such as chicken, non fatty pork & avoid red meats such as beef or mutton as such takes a far longer time for the Human digestive system to process for necessary minerals to keep the body functioning...
The IMMEDIATE solution would be to KEEP CALM always, as ANY PANIC from the mind would INDUCE the heart to beat stronger before, a kinetic energy that would heat up & burn organs - Human cells would not survive high temperatures. It is a psychological issue that most ignore, but as one's life is at stake, no harm in trying it out or else be dead. Think of better thoughts - calm & peace, the waves of seas, blue skies, etc...
When nausea occurs, it is merely a trip to the toilet to let it all out. It would be better, as it may be in the food intake that had trigger the situation - a Human body reaction to adverse food intake, & once released, one will be able to have better rest.
Ultimately, as doctors advised - take 2 panadols & call him in the morning if the situation is not good, or go to an emergency medical 24/7 unit if med situation is not resolved...
All the best.