Welcome to SR, Muffin
I had/have/will have that problem too... the emotional rollercoaster.
Basically, I do like they said (then again they were probably the people who told me this in the first place... thanks guys), just take it slow, take time out every so often, relax for five minutes or so. Try not to let things overwhelm me--ie, get them taken care of when the situation first arises. It does seem to work for me... although I've never made it much farther than where you are at.
Take care,
TB