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
These concerns usually need timely review rather than emergency transport.
Seek emergency care for:
Trouble breathing or new chest pain
Confusion, fainting, or difficulty staying awake
Severe weakness or inability to stand
Blue, grey, or unusually pale lips or skin
Signs of shock, such as cold clammy skin or very rapid breathing
These symptoms can occur with severe infection and need immediate assessment.
And for anyone, someone who:
has had a seizure that will not stop, or does not wake up afterwards
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
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 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
Arrange prompt medical assessment if you develop a fever with an unexplained skin ulcer or painful swollen lymph nodes, especially after:
A deer-fly or tick bite
Handling a rabbit, hare, rodent, or animal carcass
Mowing or brush-cutting near a dead animal
Drinking untreated surface water
Outdoor activity in an area where tularemia occurs
Do not wait for a skin ulcer to appear if you are unwell after a high-risk exposure.
Contact your healthcare professional promptly if treatment has started but fever is not improving, symptoms return, the ulcer is spreading, or a lymph node becomes increasingly painful, red, soft, or draining.
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
The article also says
Tell the healthcare professional about the possible exposure.
Every sign above is quoted from the sofidex article on Deerfly fever. If you are not sure, err upward — it is always reasonable to be checked.