Hi Carrie:
I seem to be a lot like you in my response to intense running training, so I have not done too much of it as of late either, even though I have never enjoyed any exercise as much as I have always loved running. Hip pains, pretty much same as you, ITB puling on the hip area, etc, etc. I think, therefore, that the exercises you need are exactly those featured in To the Mat, but also, include as much firewalker moves as you can, frequently, to strengthen the gluteus medius and minimus, and gliding discs sections of Slide and Glide and High reps. All these are the sorts of exercises I was always encouraged to do in physical therapy after knee, hip, ITB injuries and issues. Also consider powerwalking those hills. As a result of the gliding disc work, mat exercises, clam shell moves, firewalker moves and powerwalking as many hills as possible each week, I can visibly see and feel the extra muscle and strength I now have in the hip/gluteus medius area, which I never had as a runner. This additional strength protects the hip, and provides mobility and strength through hip/ITB/knee chain, and stronger glutes are the bedrock of this support system.
Oh, and I forgot: if you have the STS series, in Meso 1, there's an extra/bonus disc of lower body moves (sorry, I forget the disc #): practically that entire disc could have been recommended by my physical therapists for running injuries over the years! Get it and do it weekly!!!
Clare