Hi Jamie, If you are still ...

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Hi Jamie,

If you are still looking for an answer I would recommend searching/or re-posting your question on one of the online GIS support forums dedicated to QGIS and/or GRASS.    I've had good experience with the very widely used

 https://gis.stackexchange.com/

or you could also try the QGIS and GRASS user mailing lists at nabble (although it seems like these may not be as widely or frequently used):

http://osgeo-org.1560.x6.nabble.com/Grass-Users-f3884509.html

http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html

In either case, you will likely be asked  to provide more information about your problem, including what version of QGIS (and GRASS) you are using, operating system,  parameter values you specified (or left as default) when you run r.watershed, etc...