It was the same with my DS and it passed around 8-10 weeks. Some babies just need more boob time.
Make a box of special milk time toys that your older kiddo only gets when it's nursing time. Make it really special. And get a good sling and learn to nurse in it!
I know it seems really bad now, but hang in there mama it WILL get better.
Oh, and let your house get messy! Just do the bare minimum. Cook, dishes, laundry for a while or at least while DH is away.
Also I agree that formula won't solve anything. Figure in extra time making/cleaning bottles plus the health risks could mean more doctors visits, etc.
Good luck mama, it only lasts a little while in the grand scheme of things!!