Stay at home moms, I need advice!

I just gave birth almost two weeks ago. I have a toddler (2.5) and my newborn. My two year old has been acting crazy since we've been back from the hospital. Telling us no to everything, laughing and not listening when being given direction, refusing to eat. He loves the baby but is too rough when he tries to interact with him so we have to limit the touching. But we do have him help with things to make him feel included. My fiance is a HUGE help, he has been doing everything while im recovering. And im so nervous about when he goes back to work in less than 10 days. Do any of you ladies have advice on how i can navigate this by myself while hes at work. I feel so overwhelmed. Ive been pumping and I hate it. There just seems like to much to do and I cant keep up with the house without cleaning every second. Please give me advice on how to make life easier as a transition to being a stay at home mom of two. Thank you