I am glad you are getting somewhere with the workbook, that is good to hear.
I was just going to say I have a chronically ill cat I have to do a messy/frustrating and miserable procedure on each week in order for him to live.
But I found myself getting SO ANGRY when it wasn't going right and one time I popped him on the head (not hard enough to hurt him, but I know I scared him, and I don't want him to be scared of me...he is wonderful, or else I would never do this in the first place).
Anyway, I vowed never to do that again...so now when I get frustrated taking care of him I kick or hit a door or slam my fists against it. I feel a lot better knowing I am not hurting him (plus, I can hit them harder and as often as I want).
Just a thought since I know you are frustrated as well and need to get your hurt and anger out...
And I might ask my T about your workbook. I need all the help I can get. I hope it continues to go well.