It's scary isn't it? How are you feeling now? Take it easy if you can - your body has a lot of internal mending to do.
I had accreta in my 3rd pg (after 2 csections). I had placenta previa too. The chance of accreta is higher with pp so they scanned for it and discovered it at 23 weeks.
I suspect you need to look at the risk of placenta previa too (placenta attaching too low and bleeding a lot before the end of pg). You should be able to get your gp to refer you to a consultant at the hosp to discuss it (pref the consultant who did your cs, since s/he has seen inside you).
They can scan you during pg to see if you have accreta (MRI scan in a tunnel) but they aren't that great at spotting it. Or at least they weren't in 2007, prob got better now.
With me they said "you've probably got accreta, we'll proceed as if you definitely do". Which meant a cs under general anaesthetic, a vertical incision, lots of blood on standby. I was under GA for 12 hours and woke up in Intensive care. I had a hysterectomy and a 16-pint transfusion. I did have accreta, but not where they thought it was.
Ds2 and I are completely fine now though!
Um, your questions.
Risk of miscarriage is much the same but risk of not conceiving is higher - lots of scar tissue so less space for egg to implant.
Risk of dying - they told me they "never lose anyone to accreta these days" but they didn't want me to leave the hospital (3 mths on the antenatal ward with 2 children at home and a self-employed dh, not pretty).
You didn't want to hear all that, did you? Sorry!