Nervous breakdown is the colloquial term for mental health crisis or mental illness crisis. It can look like depression, anxiety, a psychotic break. It can look like Brittany Spears or Jason Russell. You need to prevent it, not wait until you crack then deal with it as the damage will be done.
Definitely see a professional, even your family doctor if that is most accessible and figure out what will support your mental health during this incredibly stressful time.