There is a condition called post-thrombotic syndrome (PTS) which can be a long-term complication of DVTs, but with proper management, this syndrome can be avoided. PTS can affect anywhere between 20-60 percent of patients two years following a DVT.
The symptoms of PTS consist of leg aching, cramping, or pain; leg itchiness, tingling, or heaviness; swelling of the leg; varicose veins or a brownish discoloration of the skin; and even a skin ulcer. PTS symptoms typically are worse with prolonged walking.
You are already doing many of the things that prevent long-term complications of DVTs: anti-coagulation medication, compression stockings - 30 mmHg of pressure or "tightness" - and early ambulation. If you are overweight, weight loss is also beneficial.
Another suggestion is to elevate your leg above heart level three or more times a day for 5-10 minutes.
Lastly, if you're a smoker, I strongly recommend you quit.