allergic reactions

I have been tested extensively for allergies with all negative results.  I was recently exposed to some indoor mold for about 6 months. Since that time, I seem to have hypersensitive reaction to outdoor molds as well as pollen, etc. I, once again, tested negative on all skin tests and RAST testing. Is it possible that the mold exposure could be causing this type of reaction, especially since I am testing negative.  I did once get 2+ on some molds and dust mites.
Thank you for your help.

[National Jewish Health]

Mold exposure, most notably Alternaria and Cladosporium, can result in allergic problems with skin and lungs and may cause some increased sensitivity.  Even with negative testing, this may be the case, although less likely.  The most practical approach is to avoid mold in all environments, especially at home and at work.