I also suffer from severe anxiety disorder and get panic attacks. It sucks right? lol
I am in the process of Owner training my dog to be a psychiatric service dog. The process is very difficult and takes quite a long time before a dog is ready. People suggest 1-2 years of training.
You don't need to get your dog approved. You need to get yourself approved as disabled by a doctor. Technically you do not need to have a doctors note but if someone challenges you and you go to court it is going to help alot. You do have to be disabled though. You also do need the doctors note in order to travel with the psychiatric service dog or for housing.
IMO getting the note will save alot of stress and anxiety. Plus trust me as someone with severe anxiety going to the doctor is difficult but once you do, you will be oh so thankful. I have a great team of doctors and a therapist I love and it helps alot.
Anyways next your dog has to perform a task to help with your disability, it can not be a task that a pet would naturally perform. This is alittle bit more difficult with psychiatric issues such as anxiety. Comforting does not count as a task. Just making you feel better by being with you does not count as a task.
Here is some good links for tasks: http://www.iaadp.org/psd_tasks.html Psychiatric Service Dogs
Training the dog to lead you to an exit when you need to "escape", training the dog to circle you so there is space around you in a crowd, and if you do self harm during an episode being able to recognize it and stop you, etc... are some tasks. The dog should perform several where most suggest 3+
You can owner train your dog. I suggest a good citizen class and as many obedience classes as you can find. Also do not take it into public until it is proofed on ignoring food, people and distractions 99%.
Do not register your dog online, they are all scams and mean absolutely nothing as well. You do not need to do anything at all for your dog, it doesn't need to be registered or anything.
I would check out service dog central their site has a ton of info as well as doctor notes you can have your doctor copy for you.
Also a suggestion I WOULD get a doctors letter for an emotional support animal (which a letter is 100% needed), they are not allowed in public but are allowed to travel and in housing. But while your dog is in training it can also be your emotional support animal until it is ready to be a service dog.
Hope this helps