Increase your protein intake (up to 100 grams a day, if you can). That will pull fluid out of your legs and into the vessels where it belongs. Drink tons of water, with a little lemon in it if you can now and then. Put your feet up, rest (lying on your left side is best) for several minutes every hour. Meditation--visualize your blood pressure lowering, your body relaxing, your swelling decreasing, your liver and kidneys functioning optimally. Take nice, deep cleansing breaths while doing this. Soak morning and night in a bath (this has been shown to lower blood pressure, and is often used in non-pregnant people with blood pressure issues).
I don't have Susun Weed's Wise Woman Herbal in front of me (and dh is asleep in the room where it is), but I distinctly remember her saying that one should consume a cucumber a day, preferrably one that is a bit yellow--that this will help with blood pressure and edema problems.
Rather than cutting back the days that you work, can you cut back the hours instead? Instead of working 5 eight hour days, can you work 5 six hour days, with a one hour break in the middle (opportunity for you to put your feet up and rest)? I don't know what your situation is, of course. If you cut back to four days a week, see if you can get two days on, then a break of a day or two, then another two days, then another day or two break--to help you recoup.
Good luck! The more you stress about this, of course, the greater your BP increase. Visualize yourself staying healthy, having the homebirth that you want. You can do this. You must believe it.