When it's hard to sing praise

The reality of being a mom is that it's hard. The reality of pregnancy, labour, delivery, post partum...is that it changes your body, sometimes it's welcome, sometimes there's lots and lots of pain when you don't expect it (AHEMbreastfeedingAHEM).
That's my battle right now. I'm having a hard time breastfeeding, not because he's not eating enough or latching like a champ (though a bit on the small side ouch!), but because I have developed the oh so lovely thing called thrush, or yeast infection of the boobs. Too much info? Oh well. I feel it's only fair to be honest and not put up a "facebook" front that is all glorious and picture perfect.
So this is when it's been hard for me to sing praises and not curses...oy. Especially in the middle of the night when not only is there ridiculous amounts of pain but no sleep for about 6 hours straight, a distressed baby and an emotionally wrecked mommy.
I don't have the answer to giving thanks or praise easily in moments like these because I haven't been able to do that just yet, I definitely have been failing regularly at it in fact. But I am also thankful that I can fall regularly on God's grace, that even though my mouth, which should be used for praise was also used for cursing, it doesn't mean He loves me less or requires me to make it up to Him or my child through feelings of guilt.
I'm still finding it hard to be thankful when things feel like their on fire/exploding out of my skin/experiencing the worst purple nurples of all time, but I do know there is much to be thankful for, but most of all grace for when I am a miserable mess of thanklessness.