Hopefully Jenn chimes in, I know she was able to successfully relactate. I was not that lucky, it was a horrible experience and after a month of trying I was still barely producing anything. I was taking upwards of 15 pills a day (goats rue, blessed thistle, hops, fenugreek), pumping/nursing round the clock, and all I ever accomplished was a lot of frustration and heartache. I also bought an SNS feeder from Medela and would use that exclusively to latch Violet onto my breast while she had formula. We spent the better of each day in tears, it was awful. I know the feelings you are experiencing and I know how powerful they can feel. I felt guilty for wanting to give up so I kept pushing through it until what I ended up with was one MEGA stressed out mama and a baby whose sleeping/nursing routine had been majorly effed with.
Once we ditched the relactation efforts, things got a lot better. I was upset for a long time and continued to have thoughts of trying again but I eventually was able to make peace with it. I had Lee take pictures of our last nursing session and that helped bring a lot of closure for me.
Every woman will have a different experience and I've ready MANY wonderful relactation stories. If you decide go go for it, I hope things go smoothly and successfully.