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
Get emergency help now if you have:
Trouble breathing
New confusion, extreme drowsiness, or difficulty waking
A seizure
Fainting or signs of very low blood pressure
Severe weakness or inability to stand
A rapidly spreading red, purple, or bruise-like rash
Very little urine or other signs of serious illness
They need emergency 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
Seek same-day medical care if you develop fever, severe headache, muscle pain, vomiting, or a new rash after a possible tick bite or time in a tick habitat.
Mention where you have recently lived or travelled and when symptoms began.
Do not wait for a spotted rash.
Do not wait for a tick test or early blood test before seeking care.
If RMSF is suspected, prompt treatment is important.
These symptoms can indicate advanced infection or another urgent condition.
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
Every sign above is quoted from the sofidex article on Rocky mountain spotted fever. If you are not sure, err upward — it is always reasonable to be checked.