I don't have much to add, everyone's already given you great advice, but I just wanted to say my brother is one of those cases of a high ANA but no symptoms - the conclusion was pretty much just "come back if you develop symptoms." As Clare points out, people without symptoms don't generally get tested, so there are probably lot more people out there with positive ANA that no one knows about. In my brother's case, he had a head injury and they did an extensive bloods panel on him and the high ANA turned up (at the time it was just slightly positive, but they retested him a while later and it was the same as yours, 1:2560). His rheumy said about 10% of the population "may transiently have positive ANAs or lupus anticoagulants." His ANA later went down some, but was (and presumably still is, though he hasnt been retested in a while) positive. Here's the thread I started about him at the time, if you're interested -
http://www.thelupussite.com/forum/showthread.php?t=63079 - but if you do have some symptoms then it's another story. Definitely see a rheumatologist in any case, they're the best informed to be able to interpret these results and integrate them with any symptoms you have. Good luck, and as Clare said, try not to worry too much in the meantime!
sf
edit - I just read some of your other posts (should have done that before I posted), and just want to add that in combination with symptoms it is (as others have said) much more likely that something is going on. Glad you're making the rheumy appointment, hope you can get in soon and get more information!