BIG HUGS TO YOU!!! dont really have any great advice for you, but can tell you we had a few similar problems...DD was and still is at times a pretty average sleeper....i laugh when i see people with their babies sleeping in prams....DD will NEVER do this, i have tried, she just cant switch off, even if she is SO tired...just cries! So i have given up on that one! She slept in her sling for most of her day sleeps, or on my lap for the first few months. Then when i got mastitus and it started getting to hot to carry her around all day we started laying on the bed and id feed her and we would both fall asleep.
She now likes to sleep in her cot or on a bed if we are on hols/at a friends but never in a pram, and i feed her to sleep and put her down when she is asleep.
I can say that the desperation i had felt that i was never going to leave the house again has subsided but (even though some people think it is stupid) i am at home for her day sleep, its to much hastle otherwise!
More hugs for you , you are doing a great job and i hope things start to get better for you.