Dear user, Firstly to control your pain, while you get further investigations. There are a couple of things that will help 1. Regular pain killers. Start with regular over the counter Paracetamol ( if you are not allergic or have liver problems). You can add on stronger pain kilkers like Diclofenac(make sure you get a prescription for some PPI e.g Pantoprazole, Esomeprazole to rotect your stomach with this), Tramadol, Oxycodone(with tjis you might need a laxative) for the first few days. 2. Pressure Stocking. You can start with class 2 elastic stockings above knee. Your pharmacist should be able to help with sizing. 3. Avoid prolonged standing 3. Elevate your leg when your sitting or lying to help rdduce the swelling. This swelling could be because of Varicose veins, Cellulitis due some infection around your foot or leg, DVT( deep vein thrombosis; this is one of more serious problems where a deep system of veins is blocked and blood keeps pooling in the legs). While you are dealing with pain, try and get an appointment with a Vascular Surgeon, if not get your doctor to examine and refer you to them. They will be able to look at the veins in your leg and the ball of vessels behind your knee. They might need to do some scans though. In the meantime, stockings and elevation should help with discomfort anyways. Thanks