Hi friend,
Welcome to Health Care Magic
Good exercise tolerance means –there is no
heart failure / swelling may not relate to the heart
It is from fluid retention and a weight gain of 10 % is generally needed for it to become obvious...
Weakness of leg veins could be the cause – can be confirmed by Doppler study of leg veins...
See an Internist / get yourself examined / at times, basic investigatton may be necessary...
Take care
Wishing speedy recovery
God bless
Good luck