Hey man, I don't really have any advice for you but I just wanted to say having all these problems and illnesses such as anxiety, depression, etc. And on top of that a stutter, most people would drift into a life of meaninglessness and idle sitting all day. Thus the fact that you have a job, which you perform to the best of your abilities and through your stutter, it's real bad ass. As for blocks, I've noticed my blocks go away when I'm relaxed and not nervous. This is easier said then done ofcourse but when your speaking at the office next time, try to take a second or two before speaking to take a deep breath and get rid of any anxiety or anticipation of the stutter. Slowly your social anxiety will get better and along with it your stutter aswell.