My guess is lack of enough oxygen in the leg veins and that is COPD. Take things slower and when your legs begin to hurt, stop till the feeling lets up.

It is hard when we know something is wrong and the docs don't help. Breathe easy

After you rest a bit does the leg pain go away ? Then you can walk again until the pain starts again ?

an FEV1 of 50 to 80 percent means moderate COPD, which is in stage 2

http://advantage.ok.gov/CHCC/Publications/Spiro...

I went through 5 dr. before I found the one that has kept me alive.Due to auto accident, my air sacs won't open on their own.Carbon Dioxide will not exhale, so oxygen can inhale. A Trelogy machine(in home ventolator) breaths my oxygen forceful enough to force carbon out & fresh oxygen connected to machine in. I can now sleep & am out of bed after 3 years.Keep on looking for the right Critical Care Pulmonolist.My next goal is stem cell therapy.You are not alone.I joined the team tonight & have learned from everyone sharing their stories, we are not alone! God always has us, but finding the right Dr. is critical!

i have had 2 excerbations nothing serious to be hospitalized my first exacerbation i walked around for months didn't know i complained to my Dr's my Cardio my Family my Lung Dr they all blew me off finally i went to ER and hooked to heart machine i set the alarms off for my breathing they walked me few laps around ER hooked me back up to machine and that's how i found out i had a exacerbation 2nd time i had one i knew it i went to my Lung Dr told him i was having exacerbation he blew me off went to my family Dr blew me off asked for 2nd opinion from another lung dr and she hit it and knew i was done breathing treatment steroids and sent home and i just went in to ER not long ago with Lung infection and early puemonia i had my puemonia shot also