I think iv badly sprained my foot, but i'm in agony a day after it, i couldn't walk in it to begin with but today i can't make it stop hurting any adv?

Try RICE.: The treatment usually begins with Rest, Ice application, Compression and Elevation.(RICE). After twenty four hours, the swelling should be reduced as well as the pain. There is always a possibility that you may have done more damage than a sprain. Crutches may be needed to help with ambulation. You can't go wrong by having it examined in your doctor's surgery. A stabilization boot might help.

Elevate, get exam: Swelling gets worse for 2-3 days after injury; if you keep your foot low this can cause more swelling/more pain. Elevate your foot above your head for fastest relief, plus ibuprofen for pain (600 mg every 6hrs, with food in stomach) and ice. Severe pain makes an underlying fracture more likely, so get examined, you may need an Xray. No weight bearing until you know (or it becomes pain free)