I would stay positive and you can't feel baby move yet until a few more weeks anyways. So just take it easy and hope all goes well for you!
I've been feeling the same way lately. The odds that we do have a mmc are very low though. We are about the same size, I feel like my belly popped a few weeks ago and hasn't changed since. I've had the flu the past 2 wks, haven't had an appetite and have been losing weight. I know the baby should be pulling what it needs from me and that it's only me suffering; but I can't help but feeling I've done harm. We just have to try to stay positive and hang in there.