Congrats, Daveo! You're doing great!
My surgeon (Dr. Gross in South Carolina) has a specific walking regimen. In fact, he has phase I exercises (for the first six weeks) and phase II exercises (6 weeks to 6 months). For week 2, no more than 1/4 mile, and then for each subsequent week add 1/4 mile. He reccomends that you continue to use a crutch and/or cane on your walks for the first 4 weeks, or longer if needed. Here is a link to his "forms" page:
http://www.grossortho.com/formsIf you scroll down, you'll find links to the phase I and II word documents. Keep in mind, Dr. Gross is VERY conservative, but he also has the best long-term results possibly in the world.
I'm six weeks out on my second hip, and I kept the crutches/cane for about 3 weeks. At about the 2-weeks point I didn't need the cane to putter around the house, but when I went anywhere I took it. I stopped using the cane altogether at 4 weeks, but everyone is different.
I didn't really get cramps, but I iced basically all day, on and off. I had one of the polar ice machines, and used in intermittently all day for the first 3-4 weeks. Perhaps try icing more? Also, can you work while reclined? My first hip I didn't go back to work for 6 weeks, and even then it was uncomfortable to sit for more than 1/2 hour. This hip has recovered MUCH faster, but sitting at 90 degrees was still uncomforable at 3 weeks. At six weeks now I'm fine.
I did not have the auto-pump at all. Dr. Gross suggests doing foot pumps (see phase I document), 30x every waking hour. If you can do that, you probably don't need the pump. This was for the first two weeks in order to prevent clotting.
Anyway, go download those documents and you'll know what Dr. Gross recommends. Other's might reply with different information, as some doctors are a bit more aggressive with PT. Either way, take it easy and take your time. It's a marathon, not a sprint.
Best of luck to you. This will be a distant memory before you know it.