Good advice on here about relactation - yes give it a go
But if you do try and it doesn't work out, or if you decide that you can't face it and don't have the support that you would need, then please please don't feel guilty
I was in a similar situation, had a horrible time bfing dd but got support and carried on for a year
When ds was born, we started down the same road and I decided after 3 weeks I could not handle it at all, I was heading for PND
So I switched to ff and felt crap about it, but I am gradually starting to ease off on myself (he's 8mo now)
Your dd got some colostrum inside her, which is brilliant. Then you made a decision which I for one can totally understand.
I'm sorry you are feeling sad about it. I really understand that sadness. I'm sorry you got no support when your dd was born too.