Hi Victoria -- I've found the herb Fenugreek seed to help with milk production quite a bit. I drink it as a tea... it's a little bitter, so I usually throw in a second teabag (green tea or something with no caffeine). When your sweat start to smell sweet like maple syrup, you know it's working.
If you're committed to breastfeeding, I would strongly recommend that you find the time and place to pump one or more times per day at work. The more you pump/nurse the higher your production will be. I know it's a challenge... I work full-time, but have a great boss and co-workers that support this choice.
Someone else mentioned it, but Kellymom.com is a great site, and La Leche League is also filled with great info. Contact your local La Leche League, lactation consultant at the hospital, or WIC lactation consultant to get some additional support that you can present to your boss about the advantages of having you continue to breastfeed your baby (less time off for illnesses, lower insurance costs, etc.). A couple sites with some additional info: http://workingmothers.suite101.com/article.cfm/working_mo...; http://askdrsears.com/html/2/T020100.asp (about 2/3rds of the way down the page there is a section on breastfeeding when returning to work); and http://www.mothering.com/articles/new_baby/breastfeeding/...
Good luck and keep on nursing, mama!!!
J.