Outside United States
The active ingredient in Roundup is Glysophate - the MSDS (material safety data sheet) found at http://agspray.net.au/msds/glyphosate360.pdf does not note any extra safety precautions related to breathing of the product. However, one would assume you have used other products besides Roundup, and since you are NOT in US, there may have been mislabeling of product. It appears that you are trying to follow the label recommendations at this point. You may need to contact a physician in your area that may specialize in Agriculture related health injuries. if you have further questions please reply back with them.