some good advice given already, i agree with trying a v shaped pillow or something similar to aid sleep, i had awful hartburn during both my pregnancies so learnt to sleep more or less sitting up in bed,
weight wise i put on about 2 stone with both boys, lost the majority of it very quickly but really had to work to get the last 1/2stone off (have just managed it a yr after given birth).
I was back in most of my normal clothes about 6weeks after birth but jeans and tighter thnigs took a few more weeks.
congratulations on your pregnancy