Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Suspected shock always needs emergency help.
Call your local emergency number immediately if someone has signs such as confusion, collapse, rapid breathing, cold clammy skin, a weak rapid pulse, or severe weakness—especially after an injury, bleeding, infection, allergic reaction, or chest symptoms.
Do not drive a person with suspected shock to hospital if emergency transport is available.
Their condition may worsen on the way, and paramedics can begin treatment.
Seek urgent reassessment for worsening breathlessness, reduced urination, fever with increasing illness, fainting, new chest pain, or recurrent confusion.
After recovery, arrange routine medical follow-up for ongoing tiredness, reduced mobility, medication concerns, wound problems, or emotional symptoms.
The article also says
While waiting for help:
Keep the person still and warm
Control visible bleeding with firm direct pressure
Use a prescribed adrenaline auto-injector if anaphylaxis is suspected
Do not give food or drink
Do not move someone with a possible head, neck, or back injury unless necessary for safety
Begin CPR and use an automated defibrillator if the person is unresponsive and not breathing normally
Every sign above is quoted from the sofidex article on Shock. If you are not sure, err upward — it is always reasonable to be checked.