The cellphone in your pocket would be way more of a problem then any RFID card. Chances are if you work in an office or live in an apartment you already have an RFID card on you.
You currently are being bombarded by signals from satellites, cell towers, airport radar, weather radar, many WiFi receivers and transmitters (Clear, Comcast WiFi...), radio antennas, military radio stations, power lines and so on... When i was a kid i used to build AM crystal radios. They were powered just by the radio signal, no batteries... Am i worried, not really. If you were a cave man that has been frozen for a million years and we thawed you then the radiation that is generally in the air might give you issues but in realty we have gotten use to it. The magic bands produce the amount of energy as your cell phone and transmit on WiFi frequencies but only when triggered. They do not transmit all of the time, they listen all of the time but not transmit. Here is the link to the application they made to the FCC. Skip the foil hats, they just keep the "crazy" in...
High amounts of electromagnetic radiation can cause headaches and/or anxiety in people who are very sensitive to it.
You can buy a magnetometer from the web if you are having issues and just walk around your house and see where the high concentrations are coming from. Look on ebay for "GAUSSMETER". I would look for things like gas leaks, humidity issues (i.e. too dry), products you use that are causing headaches, and so on (for me the smell of fresh cut grass gives me a splitting headache). Magnetism would be the last thing i would look at. Good luck.
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