A darkbrown spider bit my foot on Tues had a blister swollen on&around the bite it's red & itching bad I have pain in my ankle should I be worried?

Spider bites. Seek medical attention today. You may need a tetanus shot and possibly antibiotics for infection. Furthermore assessment may identify the type of spider ( black widow, brown recluse) . If available kill the spider and bring it with you. Meanwhile ice the area and elevate your leg. Motrin/Advil may help with pain/swelling. See a doctor/urgent care TODAY.