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 an exposed person has:
And for anyone, someone who:
Contact a poison information service promptly after swallowing a product containing toluene or xylene, even if symptoms are not yet present.
Do not induce vomiting.
Poison advice is also appropriate after a substantial inhalation, eye exposure, or widespread skin contamination.
Seek urgent assessment for coughing, wheezing, shortness of breath, repeated vomiting, increasing drowsiness, marked weakness, or worsening symptoms after leaving the exposure.
Arrange routine follow-up if headaches, memory problems, poor concentration, skin inflammation, hearing changes, or balance problems continue after repeated exposure.
Workplace-related symptoms should also be discussed with an occupational health service so the exposure can be assessed and controlled.
The article also says
Do not enter a contaminated area to attempt a rescue unless you are trained and properly equipped.
Every sign above is quoted from the sofidex article on Toluene and xylene poisoning. If you are not sure, err upward — it is always reasonable to be checked.