I feel my breathing more elaborate and I am sweating a lot

I am 43 years old and diagnosed about two years with COPD, with a FEV1 of 71%. I had already quit smoking a few months before the diagnosis and I have been exercising with long walks daily, as I followed the medication to the letter. However, I feel that my breathing is more elaborate, more rude. Another situation that I have noticed, although not new to me, is that I am sweating a lot. I always sweated a lot and it's a family thing, it's even a joke between us. But this summer has been marked by situations that only with a little effort, I am literally pouring water by the face. On a professional level, it is sometimes boring. But I am concerned that the signs are that my body is in strain because of my lungs. Someone has passed or goes through a similar situation ...

Thanks