Hi
Now that you mention blood clots, high blood pressure,
kidney dysfunction, diabetes and hypothyroidism should be ruled out. A color dopplar or an angiogram is able to diagnose the clots and deep vein thrombosis. Lipid profile, liver function tests, pancreatic enzymes, blood sugar, platelet count, kidney function tests are a few things you should check for.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!