What to do while I wait for a response on a claim and the new decision of the board? and is there someone trained who can guide me?
Don't you worry. You can enlist the help of a VA accredited attorney or agent to help you request a decision review.
This reminds me of VA Supplemental Claims. Can I file a Supplemental Claim?
You can file a Supplemental Claim within 1 year of a decision if you have new evidence , unless one of these rare situations applies to you .