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 a seizure, loss of consciousness, severe confusion, sudden weakness, new speech difficulty, repeated vomiting, or rapidly increasing sleepiness.
These are emergency symptoms rather than issues to wait to discuss at a routine visit.
Contact the treating team promptly for a returning or worsening headache, fever, vomiting, increasing fatigue, new medicine side effects, or redness, drainage, or pain around an intravenous line or surgical wound.
Follow-up is an essential part of treatment.
Repeat MRI or CT scans allow the medical team to check whether the abscess and surrounding swelling are shrinking.
Imaging findings may improve more slowly than symptoms, so doctors consider both when making decisions.
Keep routine appointments even when symptoms are improving.
Do not stop antimicrobial or antiseizure medicine without speaking with the treating team.
Ask when it is safe to drive, work, exercise, travel, or drink alcohol, as restrictions depend on recovery and seizure risk.
The article also says
People receiving long courses of antimicrobial medicine may need regular blood tests.
These tests can monitor kidney function, liver function, blood cell counts, inflammation, and possible medicine side effects.
If treatment continues at home through an intravenous line, the care team will explain how to protect the line and recognize infection or blockage.
Rehabilitation may begin in the hospital and continue after discharge.
Physical therapy can help with strength, balance, and walking.
Occupational therapy supports daily activities, while speech-language therapy can address communication, thinking, or swallowing problems.
Every sign above is quoted from the sofidex article on Brain abscess. If you are not sure, err upward — it is always reasonable to be checked.