### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My right knee all the way down to my ankle will swell to twice the size of my other leg. Behind my knee is swollen like a tennis ball sticking out blood vessels have showed up everywhere. It feels like it has fever and is very painful.I went to ER and they said they coucouldn t find anything. Please help me Im in tears.

### output:

Dear user, Firstly to control your pain, while you get further investigations. There are a couple of things that will help1. Regular painkillers. Start with regular over the counter Paracetamol (if you are not allergic or have liver problems). You can add on stronger pain killers like Diclofenac(make sure you get a prescription for some PPI e.g. Pantoprazole, Omeprazole to protect your stomach with this), Tramadol, Oxycodone(with this 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 standing3. Elevate your leg when you're sitting or lying to help reduce 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 anyway. Thanks