Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Progressive weakness, trouble walking, difficulty swallowing, or breathing problems should be treated as an emergency.
Routine follow-up may not be needed when symptoms are mild, fluids are staying down, and the illness steadily improves.
Continue drinking enough fluid and return gradually to usual meals and activities.
Follow-up is also appropriate for continued abdominal pain, weight loss, recurring fever, ongoing blood in the stool, or signs of dehydration.
In the weeks after infection, arrange medical assessment for new joint swelling, persistent bowel changes, numbness, or tingling.
The article also says
Contact a healthcare professional if diarrhea is not improving, returns after getting better, or lasts longer than expected.
If antibiotics were prescribed, take them exactly as directed and contact the prescriber if symptoms worsen or side effects occur.
Repeat stool testing is not routinely needed after recovery, but it may be required for certain jobs, childcare settings, or public health investigations.
Public health staff may contact people with a confirmed infection to identify possible food, water, workplace, or outbreak exposures.
Sharing accurate information can help prevent additional illnesses.
Every sign above is quoted from the sofidex article on Campylobacteriosis. If you are not sure, err upward — it is always reasonable to be checked.