Philbee, I am very sorry for your loss.
After my mc at the end of June, I did have times of feeling I did not want to get out of bed, feeling a failure, an as though I would never be happy again. Having talked to other women who mc on here, and in real life, I don't think anything you describe seems "abnormal", for want of a better word (nothing about mc seems "normal", does it?).
All I can say is that (trite as it sounds) I just took one day at a time, took things at my own pace, and tried to do as little or as much as I wanted each day. I also leaned on my DH a lot. I did cry the first time I went to our toddler group, but everyone was kind and understood (and if they hadn't understood, then who cares, frankly?). I found I wanted to talk about what happened, so I emailed my friends to tell them what had happened, and that I hoped we could talk about (or not avoid talking about) what happened. All my friends were open to discussing the mc, and I found out that even more of them than I knew about had had mcs themselves, so I got some really kind support from them. MN has also been a lifeline.
The loss of my baby will always be part of me, but it does not consume me any more, as it did for the first couple of weeks. I feel happy and hopeful again, most of the time; though I still cry sometimes, stress quite a bit about it happening again, and worry about what went wrong.
Regarding the flashbacks, if they continue, then it might be a good idea to speak to someone about it - flashbacks can be a symptom of PTSD. My GP referred me to a psychologist after a traumatic experience a few years ago, and it helped to talk through what had happened.
Take care, and don't feel you need to rush to "get over it".