I posted a question on facebook asking friends who refused to wear masks why they had problems. A lot of them came back with having a feeling of suffocation (not literally) that brings on a panic attack. One person said they use the "bubble" type which I think is an N95 but had to periodically go to a room and remove it to get through the day. Are there other types of masks available that you would recommend? would just a face shield be almost as effective as a mask?