Hello and thanks for the query
In my opinion you need a medical attention for your symptoms. This swelling and other symptoms may be due to insect bite that is caused during sleep. Do Ice fermentation at the site. Keep the foot elevated and do active movements of the toes. Take some analgesic
and anti-inflammatory drugs to reduce pain. Keep your self hydrated and take semiliquid and fresh diet.
If the site is itching that you need anti-histamine
drugs to get rid over it. Consult your doctor immediately and find out the cause of the symptoms.
Best Wishes and have a speedy recovery