How long have you been taking beta blockers, the whole of the experience with WPW?
BB can lower both blood pressure and heart rate and these, especially if combined and extreme, will cause some dizziness. I have had the problem myself, but at only at much higher dose than 50 mg. BB have a long list of possible problem side-effects.
Have you had any discussions with your doctor about an Ablation to cure the WPW? I understand that is an effective cure... but then you may not have serious symptoms that would justify such an action. As far as you current set of symptoms, I can not say without looking up a description of WPW to say if they could be related to WPW. The "normal" symptoms are listed and discussed on past posts of this Community (Forum). Take a look at:
http://www.medhelp.org/search?query=WPW+Symptoms&camp=top_nav_search