G-
You have raised the question of blood clots.
While you were in the hospital, did they keep those balloons around your legs that keep your blood circulating? They wrap around your legs and fill with air and deplete it over and over again. I am sure there is a more formidable name for these leg pumps.
Did you see your doctor when he told you about the potassium?
When you say achy, do you mean flu-like? Is it a specific location in your legs or all over?
Here is a link I found:
http://www.emedicinehealth.com/blood_clot_in_the_legs/article_em.htmFrom the site:
Symptoms occur in the affected leg when a clot obstructs blood flow and causes inflammation. Symptoms may include the following:
Swelling
Gradual onset of pain
Redness
Warm to touch
Worsening leg pain when bending the foot
Leg cramps, especially at night
Bluish or whitish discoloration of skin
As suggested already, a quick dopplar test can identify blood clots.
Kindest regards,
Kate