Hair loss can be caused by chronic stress and symptoms can present themselves anywhere after 3 weeks to 6 months after a very stressful event. This condition tends to be short-lived and will grow back as soon as you are able to reduce your stress levels. Medication can work to slow down the amount of hair lost.
Stress can also cause other symptoms like fatigue and a sense of feeling overwhelmed. If this is accompanying your other symptoms then it might be time to investigate whether your hair loss is due to high levels of stress.