This will be long - apologies.
We had such a difficult start after a hoped-for waterbirth, wasn't able to initiate bf at the start as firstly the placenta wouldn't deliver, and when it eventually did, a 3rd degree tear was discovered and I had to go to theatre for an epidural and repair.
I have flat nipples, and the first time she latched on was about 5/6 hours after birth. A mw latched her on in recovery, and although it was painful I assumed it was because my nipple had never done this before. Sure enough, when she came off it was cracked and bleeding. Couldn't get her latched onto the other side at all, as my right nipple is SO flat it wasn't triggering her suck reflex. Support down on the postnatal ward was so awful, I was catheterised and immobile, and they kept trying to get her onto the right nipple when it clearly wasn't going to happen. The left nipple, meanwhile, just got more and more cracked as I decided to ignore the right in favour of the left. She eventually got a cup feed of formula at about 22 hours old.
The following night was worse, I was half mad with sleep deprivation and I either got a disinterested mw who stayed for five mins and told me she wasn't latching because she wasn't hungry, or someone who promised to come back to me and then didn't. She got another cup feed of formula at Saturday lunchtime because a long time had again elapsed since feeding from the "good" side.
I then came across a wonderful, supportive student mw who recognised that I was a good candidate for nipple shields, who sent DH out for some. They've made a massive difference - she can now latch onto both boobs, although I know the latch isn't perfect as they are both sore even when I use the shield. But at least she was latching! I was encouraged to stay in hospital an extra night to improve the feeding, which was a bit of a joke as the person tasked with helping me that night never returned after about 9pm. Thank god they allowed DH to stay with me (I had my own room), otherwise I probably would have broken down.
We were discharged yesterday. Still wasn't feeling particularly confident but there was nothing at all to be gained from staying. I've spent the last 24 hours feeling confused as to when she wanted feeding and when it's wind. Maybe I'm labelling her fractious behaviour as "wind" when she's hungry? 
The fact she seemed to be breastfeeding quite well, albeit with shields, has been such a relief to me, maybe I've relaxed TOO much.
Milk only came in last night. Don't know know much weight she's lost as the community midwives didn't visit as planned today. I plan to hit some BF groups, but I'm still very sore and physically/mentally delicate and I'm not sure I'm up for leaving the house quite yet.
Now to the pertinent questions:
She pooed quite a few times from soon after delivery to about 30 hours old, but nothing since. I put it down to milk coming in, and difficulty with getting colostrum when in hospital. When can I expect to see this improve? She has wet nappies, although the wee seems dark which is a worry.
She has really smelly farts - can this mean anything? This is why I often don't know why she's crying - is it wind or hunger? If suckling comforts her, should I just let her or would it make any wind worse?
I know using nipple shields isn't great, but it's either that or no boob at all 