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
TSS is an emergency.
Call emergency services or go to an emergency department if you develop a sudden fever or feel severely unwell along with symptoms such as:
Faintness, collapse, confusion, or extreme weakness
A widespread red rash
Repeated vomiting or diarrhea
Breathing difficulty
Very little urine
Rapidly worsening pain, swelling, or redness around a wound
Do not delay emergency help while trying to remove something that is stuck.
Seek emergency help again if severe symptoms return suddenly.
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 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
This is especially urgent during menstruation with a tampon or other internal product in place, or after surgery, childbirth, a burn, wound packing, or a skin infection.
3
Does any of this apply?
Book an appointment
After treatment, arrange routine follow-up for persistent fatigue, weakness, wound concerns, or questions about returning to work, exercise, or menstrual products.
The article also says
If a tampon or removable menstrual product is in place, remove it if you can do so easily.
Every sign above is quoted from the sofidex article on Toxic shock syndrome. If you are not sure, err upward — it is always reasonable to be checked.