You are still in 'shock' phase. At two months, I was still barely eating and sleeping, functioning on some odd/creepy automatic pilot. Slowly, your days will get easier, then raw pain will lessen to a dull pain (still there, but more manageable). Your mind and your heart will help you heal. Don't fight your emotions, but also do things to get your mind off of things every now and then.
Replaced. Yep. I know that feeling. Its not a good one.
How much are you contacting him? I would keep it minimal. I would start making decisions on your own (finding more work, care for your son). When are you going back to your house? I would start making it your own, move furniture, do things differently. All of these things will make you feel empowered and help you a lot.
