Haunted by a feeling: ghost story

She was haunted by bittersweet feelings. At first, she'd thought it was just because of her natural memories bubbling up, brought up by phone calls or letters or mentions in books or TV, links that tied her back to her past and made her remember the old times and wish they were still with her. Then she realized that sometimes, they came on their own. They had nothing to do with what she was doing or seeing. She thought she had a mood imbalance, then, for a while. She wondered if she was depressed and just didn't know it; but the ads on TV always made depression seem far worse than this. Crying over a plate of frosted cupcakes one day, she realized the truth: she was haunted. Not by a ghost, or if it was a ghost, it was far more unobtrusive than she'd been--

Inspiration: My own bittersweet feelings and "Comin' Back" by the Crystal Method.
Story Potential: Medium.
Notes: Eh. Not bad, but it doesn't grab me.