Hello Alan, the swelling sounds like DVT, deep vein thrombosis. I understand that you've been given blood thinner, but the swelling does sound like DVT to me, especially considering you've been out of exercises for a few weeks. The blood clot haven't blocked the entire vein path, therefore the swelling goes down sometimes. I'll recommend you to call your doctor at your earliest convenience. DVT, at some point, can be life-threatening, but if you treat it early, it's going to be okay.