CVS – where is the stock going?

So 4% of my portfolio is in CVS and now I’m down 16% on my investment. I’m at a point where I need to make a decision and perhaps cut losses.

What do people think about the long term prospects of the company?

I’m a big believer in the growth prospects for healthcare, CVS balance sheet looks good enough, and their moves into primary care sound great.

Why does it keep going down in value? What am I missing?