Estrogen isn't all that bad. You may find that after a day or two, you start feeling so much better. Since your surgery was 10+ months ago, if you haven't already, you may want to start exercising, as in a gym, or road walking. You can still rebuild your bones, but you have to encourage them.
When a bone is put under stress, a weight-lifting stress, it reacts by trying to build up more bone material on the inside. You may be young enough that with the HRT and exercise, you might actually be able to rebuild bone density. Worst case scenario, you keep it from getting worse.
What may help the most is getting your daily life into a predictable rhythm. We people are creatures of habit. It's all well and good to be chaotic when we are in our teens and twenties, but we do so much better, especially our kids, if we have a predictable schedule.
You might also try getting one of those week-long pill dispensers from your local pharmacy, and spread your meds all on one day, like Sunday. Your Fosamax goes in the Saturday box (or whichever), and when you empty the boxes, it's time to refill them. It helps a great deal.
Best wishes, keep talking, you aren't alone