I've read that the 60 to 90 day period is a tough time for many. At around 60 days I went through a tough time yet 2 weeks later I'm brimming with confidence. It would appear that these ups and downs are cyclical to a large degree and as such it is important to remember that we're playing for the long game and thus there will be waves to be ridden and troughs to plough through before things level out. Many find some stability around 90 days and others take longer but most with success stories concur that between 3 and 6 months things settle down.
The main thing is that there is a finite time on this emotional rollercoaster. I remind myself of that when it gets bad. I've decided to at least get to 180 days before I decide. I reckon when I manage to get there (fingers crossed) I'll have the strength and perspective I need to take the decision I know in my heart to be the right one for me.