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 for severe trouble breathing, chest pain, collapse, inability to wake, signs of stroke, or swelling of the face or throat.
Seek urgent same-day advice for repeated vomiting, inability to keep fluids down, worsening shortness of breath, new weakness or numbness, difficulty urinating, or pain that is severe despite the recommended treatment.
Follow the discharge instructions for your main procedure, which may identify additional urgent symptoms.
For routine advice, contact your healthcare team if a sore throat, nausea, dizziness, or unusual tiredness is not gradually improving.
Also report dental damage, persistent confusion, memory problems, or any memory of events while you were meant to be unconscious.
Every sign above is quoted from the sofidex article on General anesthesia. If you are not sure, err upward — it is always reasonable to be checked.