What type of voice and breathing problems do you have?
I had breathing issues when I was still really hypo. What thyroid replacement medication/dosage are you on? Maybe it's not enough. What are your current thyroid hormone levels? You should be getting tested for Free T3, Free T4 and TSH on a regular basis.
Please post whatever test results you have, along with reference ranges, which vary lab to lab, so must come from your own report.
Just out of curiosity, what does USMC stand for? Are you treated by military doctors?