Done breastfeeding blues

After 20 weeks we've finally made the switch from breast to formula today. We've been mixing 50-50 for the last two weeks and slowly adding more bottle feedings instead of nursing. I last nursed my boy about five days ago and today was his last day of expressed milk since I'm having a hard time pumping enough without regular feedings mixed in. I just didn't expect it to hit me so hard. I know I made the right choice between work and other personal things going on which made breastfeeding any longer virtually impossible and he took to the bottle very well. However, I already miss the bonding time that nursing gave and the post-breastfeeding snuggles when he passed out in a milk coma. He's also struggling a bit with gas and more difficult bowel movements, which just make me feel so guilty, especially since he was such a good breastfeeder. Anyway, I just wanted to vent a little. I'm sure it'll get easier and I'm glad others can be more involved with his feedings now, but I don't have to be happy about it.