it's tough when you're not getting enough sleep.
Lots of babies seem to go through a fussy stage at around 4 months but they usually settle down until again after a few weeks (until the next one :P)
Do you breastfeed? Maybe its a growth spurt and she's just doing what she needs to do to increase your supply.
Do you co-sleep or sleep with her in your room? I'm just thinking that maybe if she's closer to you in the night that it will be easier for you to get up to her and your sleep won't be so broken.
I doubt that her development is being harmed, as I said babies often go through fussy stages - it's just part of being a baby.
I still feed Imran at night. I find it so much less stressful for both of us to lie down for a cosy feed than trying other methods.