I'm not an expert but I do my own work, so I have a couple of suggestions. First is the guitar wet? What I mean by that is is it getting too much humidity. Some people go overboard with those little humidifiers and the top can create a bit of a belly, which could easily raise your action. I have a hygrometer that I lay in the case with my guitar every so often to see if the humidity levels are within reason. The next thing I'd check would be the relief and action, something could be out of wack that you didn't notice until now. Here's a site Brian Kimsey has up that I've found to be an excellent resource for setting up my acoustics.
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I can completely understand if you just want to take to someone, but there's a good chance it might be something simple. A capo, ruler and set of feeler gauges can go a long way. Good luck either way.