Am I just getting older, or is Lupus taking away my voice?

Wondering if I’m aging, or if one of my many medical conditions such as ( Lupus, Rheumatoid Arthritis, Hemochromatosis, Fibromyalgia, Polycystic ovary syndrome ) could be taking away my voice. I'm 37f. And have been losing the high pitch in my voice. I also have been having a hard time with controlling the volume of it. The worst is when I am talking for more than a sentence my chest begins to feel strange, heart beat becomes more intense, and a coughing fit starts up. I'm having an incredibly hard time communicating due to this. Someone dear, and near to me has brought up to me a few times that I’m getting older, and our bodies change. I fully understand that, but is this normal how unpredictable, and uncomfortable it feels? I'm feeling very confused about my body, and it’s hard to trust my fuzzy mind. Maybee I am just old now >_< Insight into this would be much appreciated. I also hope you have a wonderful day ^_^