I find I get breathless just trying to hoover in living room have to stop as go lightheaded start feeling hot and wobbly hence can't do a lot even when want to and when weather warmer gets even worse trying do anything been checked for various things but been told all part of my fibromyalgia symptoms so looks like just going to have live with it x

Costocondritis can certainly cause this. Also shallow breathing from stress even if you don't feel stressed. Your body is responding to pain in ways you may not realise.

Sometimes the pressure points in my chest can start to flare, causing my diagphragm to kind of seize up. That can make it hard to breathe.

Yes! All the time! Today we went grocery shopping, and by the time we got home and unloaded everything, I just had to sit down and catch my breath for about 15 minutes.

I have asthma for the last 35 years and the weather effects my breathing and very cold, very windy days find it difficult to breathe, same for hot, humid weather, walking too fast also.