You'd be surprised they may just fit! I didn't think their heads would be big enough but they were...
Don't feel bad if you wean early, any breast milk you give them is a blessing and they will do just fine on formula. I and almost everyone I know was a formula baby and we all turned out just fine! well, we maybe a little

but that has NOTHING to do with the formula!
We also had days(weeks!!) like that Care...poor Jackson. Where are you napping him? Is it in a separate room that is out of the commotion of the rest of the house? I know if they don't get good naps they don't sleep well at night. Also, I can reassure you that at around 3-4months they will be soooooo much better. You will rarely have the inconsolable crying at all. We had a major meltdown with Emerson today we were at Julies aunts house for lunch and she was cranky and tired so I put her down in their crib and she started wailing, and was incnsolable (this hasn't happened in like a month) I knew it was just that she was over tired and did not get good naps the day before cause we were out car shopping and took her. So she missed one or two naps. I ended up laying with her on my chest in my aunts bed till she cried herself to sleep. It was AWEFUL, it was definately reminisent of their colic-y days.