Losing someone you love cases grief. We all know that. But losing other things can trigger this emotion as well. These can include losing your ability to do things because of an illness, your youth, your kids as they grow up, your job, your spouse due to a divorce, etc.
Loss equates change and sometimes that change can feel overwhelming. What's more, we all cope in our own way. Some folks keep it bottled inside while others let it out for the whole world to see. Some get angry and others laugh. I know one woman that had to have a meticulously clean floor while her husband was dying. It gave her a small bit of control in an otherwise hopeless situation.
I urge you to take a look at your own life and see if you have had any losses that require you to grieve. If so, find a healthy way to work through this emotion in your own unique way.