Most people think about a crash in terms of the body: the neck, the shoulders, the headache that shows up by morning. Fewer people plan for what happens to mood. In the first week, irritability, flat days, or a sudden short temper can appear and get blamed on a bad morning, a long shift, or the other driver. Noticing them early gives you something concrete to bring to your examiner.
This is educational information, not a diagnosis. Mood shifts after a stressful event are common, and they can have many causes, including poor sleep, pain, medicines, and plain shock. Your job is not to decide what they mean. Your job is to record them clearly so someone qualified can look at the whole picture.
Why mood gets missed
When you are sore, tired, and busy with calls, paperwork, and rides, it is easy to read every irritation as a personal failing. You snap at a partner over a dropped spoon. You feel like crying in the grocery store and tell yourself it is nothing. Because each moment seems small, the pattern hides in plain sight. A week later, nobody can say whether the change started on day two or day six.
Mood also tends to move with other things: how well you slept, whether you took a medicine on an empty stomach, and how much noise and light you faced that day. That is why a short written log is more useful than trying to remember how you felt in general.
What to write down each day
Pick one time each evening and spend two minutes on a simple entry. A notebook or a note on your phone works. Write the date, then answer four questions in your own words.
First, rate your overall mood from zero to ten, with zero meaning the worst you have felt and ten meaning your normal. Use the same scale every day so the numbers can be compared.
Second, note any moment that felt out of character. Write what happened, what came right before it, and how long it lasted. A line such as "snapped at my daughter at dinner after she asked about the car" is more useful than the single word "irritable."
Third, record sleep: when you went to bed, roughly when you woke, and whether you woke during the night. Mood and sleep often move together, and examiners ask about both.
Fourth, list anything new you took, from prescriptions to over-the-counter pills, along with the time you took it. If you stopped something, write that down too.
Signs that deserve a call sooner
Some changes should not wait for your next scheduled visit. Contact a clinician the same day if your mood drops sharply, if you feel hopeless, or if confusion, slurred speech, or a new severe headache appears. If you have any thoughts of harming yourself, contact emergency services or a crisis line right away.
Less urgent changes still matter. If the irritability lasts most of the week, if you pull away from people you normally enjoy, or if you feel like you are no longer yourself, bring your log to your next appointment and say so at the start of the visit, not at the end.
Bringing the log to your exam
Your examiner will ask about the first days in detail, so a log written as things happened is worth more than a summary written later. Read it before the appointment. Pick two or three entries that feel most important and be ready to describe them plainly. Include what you were doing, who was there, and what helped or made it worse.
You can keep the log private if you prefer, but do not throw it away. Many people find that by the second or third week they can see patterns they missed. Those patterns are not a verdict on what happened to you. They are information that helps your care team decide what to look at next.
Mood after a crash is real, and it deserves the same attention as a stiff neck. Write it down, notice what changes, and get it in front of someone who can look at your whole situation this week.