We never did find a portable vacuum cleaner that didn't smell too much even though we bought two especially made for EI people. We finally got central vac and it is perfect for us. One of the lovely perks of this disease is the money one can throw away just looking for something to use. If you are allergic to mold, which most people are, get rid of it in your house. The sad truth is that if it's a mold you are allergic to and it's big enough to see, it's big enough to hurt your sinuses.
Chemical exposure is relatively easy to control but mold presents an ongoing challenge.
Clean out your ventilation system because mold thrives here. Have your car's air conditioner cleaned or don't use it at all. Install some sort of central air cleaner. In my opinion, you still need a portable HEPA filter for use in your room at night and to back up your central system during the day. Most of my mold problems come from food in the refrigerator.