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Complete Tom's conversation with his counselor about his recent mood swings.
"I've been having a really tough time lately. My mood keeps _________________________ from happy to sad for no reason. Sometimes I _________________________ down in the dumps, and other times I'm on top of the world. It's like I'm on an emotional _________________________. Do you think this is normal for someone my age?"
changing - "Mood changing" describes the natural fluctuation between different emotional states.
feel - "Feel down in the dumps" is an idiomatic expression meaning to feel sad or depressed.
roller coaster - "Emotional roller coaster" is a common metaphor for experiencing rapid ups and downs in emotions.