I feel like I'm in a slightly better postition then I once was but I think this is simply attributed to time (which I am okay with, slow progress is better then no progress). I am approaching one year and just tired of the constant feeling there. My buttocks area is sore just as your described, and the jolting pain sensations are infrequent for me as well.
Does your PT have any idea what the problem could be? If it's not muscle or the sphincter is it nerve damage? Such a crazy situation, please keep me updated I will do the same.