Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services now if someone has severe trouble breathing, collapses, has a seizure, is difficult to wake, turns blue or grey, or has severe chest or abdominal pain.
Also seek emergency care for vomiting blood, marked drooling, inability to swallow, a hoarse voice with breathing difficulty, or signs of a deep eye burn.
And for anyone, someone who:
Contact a poison information service promptly after any sodium hypochlorite ingestion, exposure to a concentrated product, or exposure caused by mixing cleaners.
Get urgent assessment for persistent coughing, wheezing, repeated vomiting, worsening pain, blurred vision, or ongoing eye symptoms after rinsing.
After discharge, arrange routine follow-up as advised.
Seek an earlier review if swallowing becomes difficult, food begins to stick, weight falls, breathing symptoms persist, or vision changes.
These can be signs of a healing complication rather than continued poisoning.
The article also says
Move away from fumes before making the call, if you can do so safely.
Do not re-enter a contaminated enclosed space.
Every sign above is quoted from the sofidex article on Sodium hypochlorite poisoning. If you are not sure, err upward — it is always reasonable to be checked.