Aw, I remember the first weeks with Phoebe and panicking at the thought of DH going back to work. (Come to think of it, I panicked when I only had 1 as well.)
As the others have said, it gets easier. With Natty, I was feeling very confident by about 7 weeks along, and it was pain-free. With Phoebe it was much earlier and by 3 weeks I was able to feed her standing up.
In the first few weeks of Phoebe's life Natty watched a lot of TV. It's not admirable but it worked. I did whatever worked, including bribery. It's hard, and I found settling Phoebe was tough too because Natty didn't understand that all she needed to do was wait a few minutes and then she'd have me to herself for ages while P was asleep.
TBH, regardless of how you feed, it is hard. Newborns are hard. But it really doesn't last long. Before you know it you will be 3 months down the track, DS2 will have settled down a bit (hopefully ) and DS1 will be used to it and will know the drill. You will cope, and you will even ENJOY them
It's understandable to think about FF if that's what you've got experience in. Just remember that feeding your baby isn't easy regardless of how you do it. It's worth sticking with the BF. Just take it one feed at a time and don't try to convince yourself that you are doing something wrong or something needs fixing.
You are doing such a fabulous job. Congratulations!