first answering the original poster's question of whether a service dog would help them or not... sorry but the only people that can tell you whether a service pet can help you or not is your own own treatment providers....

now about the statement of not needing any letters or papers..... short version each USA state has their own requirements of what is considered a service animal and what isnt and what papers/ letters and certificates are needed. I travel quite frequently for work and personal / family reasons. I have been held up in many towns and cities and states waiting for family and friends to locate the needed papers, letters and certificates. one time I went to a different state and they were not going to allow my service animal in a hotel because I did not have the needed letter from my doctor, certifications/licensing of my dog and my daughters dog.

line in the sand is many places ....states, towns, cities are no longer just taking the word of a person who has a pet with them. more and more they are requiring paperwork/ letters and certificates/ licensing.. especially in big cities like mine and those that I have traveled to that may have a huge homeless population where homeless people have their pets and trying to pass them off as service animals to ensure warm/ dry places to sleep and such things.

my point dont just assume because one city or one town or one state says no letters or no certificates needed that it goes for everyone and everywhere. the best thing to do is contact ones own county, city, states governing offices, they can tell you what your own locations rules and laws are on such matters... I'd hate to see someone held up somewhere stranded and having to make the choice of getting to ones destination or accomplishing what they set out to do vs handing over a service animal due to not the right paperwork/ letters or certificates.

Also something to keep in mind the USA has a new president that is changing how things are done, as it stands right now what may be legal today may not be legal and what/ how to do things tomorrow. so again the best thing to do is keep up on all the paperwork/ letters, certificates/ licensing... that way as the president is making his chances to health care/ laws/ and a host of other things all you will need to do is update what you already have to include what the president makes for changes.