Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services now if you or someone with you has:
Sudden or severe difficulty breathing
Blue, grey, or very pale lips or skin
Confusion, collapse, or difficulty staying awake
Chest pain with breathlessness, sweating, or nausea
Pink, frothy mucus with marked shortness of breath
Breathing difficulty so severe that speaking is hard
And for anyone, someone who:
is struggling to breathe, gasping, choking, or cannot get words out
Other emergency signs, for anyone
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice for new breathlessness, difficulty lying flat, rapid swelling of the legs, unexplained weight gain from fluid, a persistent cough after a serious illness, or an oxygen reading below the range your care team has set for you.
3
Does any of this apply?
Book an appointment
Routine follow-up is appropriate after hospital treatment, even when breathing is improving.
It can be used to review recovery, medicines, oxygen needs, heart or kidney health, and any problems with strength, sleep, memory, mood, or returning to work.
The article also says
Do not drive yourself if breathing is severely impaired.
Every sign above is quoted from the sofidex article on Wet lung. If you are not sure, err upward — it is always reasonable to be checked.