I am so sorry honey, there's not really anything anyone can say to make it better but please know you're not alone in how your feeling.
I had a missed miscarriage in June. I had a tiny bit of bleeding at 14 weeks and was sent for a scan, the scan showed baby's heart had stopped at 13 weeks. The most horrific image I've ever seen was the scan of her laying on her side with her hands over her face. Just awful.
I had medical management too and I was terrified for the second round of it, I spent the night before in tears because I didn't want to go. I expected it to be like something out of a horror movie and that it would be agony. My advice is not to read the patient leaflet they give you because that's what scared me, the reality was very different.
Take some big sanitary pads, I had Always nighttime with the wings and they did pretty well. The hospital do provide pads but they're those pillow sized ones with no wings that are about as absorbent as a brick. Take a few changes of knickers with you too in case of any leakages, I bought some smart price ones from Asds and chucked them afterwards, a change of pants too just in case.
I had the pessaries and nothing happened, then a few hours later they gave me two more to take orally. After I took those I had some cramps, they were fairly strong but paracetamol knocked them down (the nurse told me they could give me any painkiller I wanted right the way up to morphine so if you need anything just tell them), the cramps never got strong enough to need more than paracetamol but it varies from person to person. They weren't as painful as labour but they were regular like mini-contractions. About an hour after those two pills I heard/felt a pop and had the urge to get to the bathroom, everything came away and as soon as it did the cramps stopped. I bled quite heavily for a few hours and then that slowed down.
I bled for around four week afterwards but it was no heavier than a period and got gradually lighter. I was told I absolutely had to wait for my period to come before trying again, they said it's to make absolutely sure that the misoprostol and mifepristone is gone from your system as it can cause problems otherwise and it helps them date the next pregnancy.
Big hugs, take it easy for as long as you need to afterwards too