First of all,big hugs to you,you are doing a fantastic job!
I dont really have any advice but just wanted to let you know you are not alone I love my sleep and just cant understand why my DD (6mths) doesnt! She has always been a pretty bad sleeper,never had that magical sleep thru (everybody else's baby I know has-which doesnt help!) She only sleeps for 1/2 an hour (to the minute) stints during the day if Im lucky,I try putting her in her cot but most of the time she gets so upset I end up sitting on the couch with her in my arms! The days when we stay at home are the worst so i try to go out every day and the further away I have to drive the better! Least she will drop of to sleep in the car (still for exactly 30mins!)
I've had more times than I like to remember when I've lost it and yelled at her,then I feel terrible 'cos I've just yelled at my baby and Im suppose to be the one she can turn to for comfort I even feel disappointed in her because she doesnt sleep and I hate myself for thinking like that!
My DH thinks she is just to intellegent to sleep and must have so much going on in there she cant relax! So maybe we should think of it like that hey?!
Sorry I'm not much help,but like i said just wanted to let you know your not alone.Im sure one day they'll get there and when their teenagers and we cant get them outta bed till after noon least will be able to look back and (hopefully!) smile at these days when we're ready to pull out hair out!!
Well gotta go she's up again (its only been 2 hours!),good luck!