I felt guilty for a day or so. Like mentioned I think mainly because it didn't occur to me that I wouldn't be able to but bubs couldn't latch on and when expressing my milk suddenly dried up and no-on my doctors and LC's could get it back. It was either ff or let my baby starve to death.
I got lots of support from family but it was really the news that got to me. Around that time ff was regarded as poisoning a baby, they end up fat and less of an iq and are always sick and allergies.
About a week of guilt I got over it and my baby is healthy (1 cold in 18months) no signs of any allergies. He is meeting all his milestones and is not fat - quite lean actually.
I definitely have no guilt now - my new baby will be full time expressing and when my milk dries up I will ff. I found my baby slept soundly and my DH was able to have a better bond as he was able to feed our son. It was the right choice for us.