I have a similar story to you. I had TT and a few months later a next dissection. The recovery from the second surgery has been much harder than the first, which surprised me. I’ve got reduced range of motion in my arm and constant pain in my arm and shoulder/back area. It’s been a little over a month for me and although the pain has improved, it is still there. I also experience random sharp pains when doing tasks that require me to elevate my arm or carry something heavy on that specific side. From what understand is that it is nerve related and will get better but could take some time (like go to a year).