overexposure to WIFI signals?

I feel I am suffering from overexposure to WIFI signals.
I have been using WIFI 802.11b/g for over 3 years without any discomforts, but recently I have started transferring large files using WIFI from my macbook pro 2.16 Ghz to an Apple Airport Express 802.11b/g then connected to a NAS.
Whenever I start the transfers I get a tingling sensation in my ears, feel a raise in the temperature of my head and also stomach and start feeling agitated. At first I though it was just my mind playing tricks, then I sat my girlfriend in front of my macbook pro and started a transfer.
I then asked her if she felt any different and she described the same symptoms.
I also use a logitech vx revolution wireless mouse that uses the 2.4 Ghz band for it's receiver. And whenever I transfer files it starts behaving erratically.

Here is the setting in case someone might be interested.
Apple Airport Express 802.11b/g
Multicast rate 2Mbps
Signal power 50%
Use interface robustness
Channel 10

Is anyone suffering similar symptoms?
I wanted to buy the new airport express N, but am starting to be afraid of wifi signals.