COG,
First, congratulations on your new baby!

That is wonderful.
Second, I am so sorry that your in-laws had to return home - they have been a good support for the boys and you. Is there anyone else (neighbors, family, friends, church) that you can lean on right now to take some of the load off your shoulders? It is always a challenge with a newborn in the house, and with BPD spouse, it makes it that much harder.
I don't think that you are going to find much expression of concern from your wife right now. Between BPD, hormones from birth, and a new baby, it's unlikely that she is going to recognize that you are hurting and need compassion, too. Unfortunately, she is likely feeling abandoned as you go to take care of the rest of the family and even having your own procedure, even though it is irrational. The fact that she is retreating to the comfort of the phone shows that she is incapable of connecting with you right now. I am so sorry that is happening. I experience that same frustration and pain with my wife who chooses to connect to on line friends versus her family living in the same house as her.
So, what can you do to help yourself a little, here and there? How can you get that oxygen mask on yourself right now? That's most important. Can the kids be offloaded now and then in camps, play dates or even child care? If not, there is a technique that my T shared with me, and I use when I play with my two boys, 9 and 5, as a way to give back to myself. It is called re-parenting. When you are playing with your daughters, and they are laughing, happy, engaged, imagine that the parent that you are for them in that moment is parenting yourself as a little boy. Imagine that the love, security, attention, affection and interest that you are giving to your girls is also going to a young you. It is a way of giving to yourself while giving to your children, and it does work. Rather than feeling drained and exhausted from care giving, I have found that I feel lighter, happier and a little recharged. It is a form of self-love, and you really need some care and love right now.
Hang in there. Love your new baby. And love yourself, too. You are worth it.