jabook, looking into radio frequencies causing tinnitus a bit further, I have found some studies confirming that, while rare, some people can "hear" certain radio frequencies and it is mistaken for tinnitus. However, this is usually limited to HF, VHF, and low UHF frequencies. This might bump up against frequencies used in Wi-Fi, but is strictly a temporary annoyance and would do nothing to cause any short term or long term harm. Certainly if this was the case, having the access point moved would be a reasonable step in reducing the symptoms.
Source:
http://cat.inist.fr/?aModele=afficheN&cpsidt=15340808
(If you have access to a university or other source that can get the journal, there is some fascinating information inside, and also confirms that this is no cause for alarm)