Husband has baby fever

So we have a one year old, I'm a SAHM, he works 16+hr shifts 6 days a week. He might be doing long hauls soon which will mean he'll be gone for a month at a time.. and he wants another baby asap.. I'm not sure I'm ready to become a mama of two. We had our daughter unexpectedly and I love her to death, being her mom is the best, but I don't know how I'll manage being a mom of two.. and not to be dramatic but doing it almost completely on my own.. momma's who have 2 under 2 how is it? And moms who have husband's who are gone for a majority of the time please give me some input..