Am so sorry for your loss. I know that it feels absolutely undescribably awful when you are first told the bad news.
I have recently lost my first pregnancy in similar circumstances (missed miscarriage, no heartbeat at nearly 10 weeks) I opted for the erpc too as I wanted it to be over with as quickly and painlessly as possible.
It does get better. The first five days were absolutely terrible, you need to allow yourself to feel the grief and work through it. I don't think it is best to be at work at the moment. i don't know how on earth you managed to go back. I couldn't have done that! Regardless of which option you go for, you will probably need at least a week, if not two off. After the erpc I was also physically and emotionally very low for a week. Your doctor will provide you with a note. Of course, for some people carrying on with their routine helps to deal with things, but that isn't very practical when you are in pain and you are still bleeding. Even if they tell you it will be like a period, it probably won't be. If you have the erpc you will need to rest for a day or 2 after the anaesthetic.
Two months later I am feeling much better. It took two weeks to get over the worst and then I slowly started to get back to normal. I have bad days now and I still think about it a lot but am feeling much more positive and am ttc again.
Is your husband coming back to be with you? You will need some good support in the next few days. Have a good rest, let yourself cry as much as you need to, get some support from your family and look after yourself.
It does get better but it is still an awful thing to go through. When you are ready, there are lots of us on the TTC post mc boards who understand what you are going through and they are all very supportive.