My translation site is a bit dodgy ![omgzokool :zoinks:](http://www.intensitysquared.com/Smileys/default/grinman.gif)
Google Translate is probably the best, although far from perfect.
Caput mihi dolet=head me hurts. They have that dative construction in German too:
Der/mein Kopf tut mir weh (this is not a common expression, although possible).