My experience is that shielding reduces the intensity, but does not change the structure (frequency, modulation/pulsation) of the radiation. So, if it is the structure making you sick, you could still get sick if the intensity is relatively low but still too high for you (if you are 'hypersensitive', this means you easily sense symptoms caused by consequences of effects of the radiation).

The structure of UMTS without traffic is not the same as with traffic.

In my sleeping case of Faraday (metal wire mesh 1 x 1 millimeter) in the sousterrain the measurement is 0,1 mikroWatt/m2 (about 0,007 V/m). I sleep well but inside I 'hear' microwaves (outside I do not, I suppose there the 'pressure' is too strong). The masts are at a distance of 350 metres, but still produce 0,7 V/m (about 1500 mikroWatt/m2) in the street. When I was in a village (no masts within five kilometres) where the measurement outside was 0,1 mikroWatt/m2 (without shielding), I did not 'hear' microwaves.

Shielding is good but does not take away the structure of the radiation.

Frans