Zeurosis, That condition is called edema. It has many causes from faulty valves in your blood vessels to side-effects from certain medicines, to food allergies, and peripheral artery disease.
If you on any medications review all of their side-effects. Get tested for peripheral artery disease. Do you eat a lot of chocolate or dairy products? If so, try to cut back and see if things improve.
https://www.mayoclinic.org/diseases-conditions/peripheral-artery-disease/symptoms-causes/syc-20350557
"Persistent leg pain and swelling can indicate a blood clot deep in your vein (deep vein thrombosis, or DVT)."
https://www.mayoclinic.org/diseases-conditions/edema/symptoms-causes/syc-20366493
My calves tend to swell but they "dry" up to normal size when I sleep. And easy way to see that is to stand up with your feet together. You may see that your calves are touching each other. Do the same thing when you wake up and you may notice that there is a gap between them at that time. By the time you go to bed they might be touching each other again.
You can also squeeze the swollen area or push in with your thumb. Chances are you will get an indentation in your flesh and you can see if fill in again in a minute or so.
You may have to get a series of medical exams to verify that your heart is OK. These may a radionuclide scan with a stress test on a treadmill with an EKG. https://www.merckmanuals.com/en-ca/professional/special-subjects/principles-of-radiologic-imaging/radionuclide-scanning
&
https://www.health.harvard.edu/diseases-and-conditions/radionuclide-scanning-a-to-z#:~:text=A%20radionuclide%20scan%20is%20an,into%20a%20vein%20or%20swallowed. The bill for that is a couple thousand bucks. Depending on your insurance you may get off with just a small co-pay of a couple hundred dollars.
Or you could get a normal chest x-ray = https://www.radiologyinfo.org/en/info/chestrad
https://www.mayoclinic.org/diseases-conditions/edema/diagnosis-treatment/drc-20366532
I have it and try to do a 2.3 mile walk most days around the neighborhood, It has some inclines and slopes so it's a good workout. Takes about 50 minutes. It's easier to go downhill than uphill! My overall condition has improved but I still have swelling in my legs, ankles, and feet. It's better sometimes but it's still a pain in the butt.
How's your blood pressure? Be on the lookout for kidney disease.
Take care.
