I got a severe sunburn on the top side of my legs, arms, and stomach. My stomach is the worst, followed by legs, then arms. My feet are not sunburnt because I wore water shoes and both my feet ate swollen. The right foot is way more swollen. My feet both feel weird and heavy and a little bit of pain shooting through my feet. Its day 4 after initial sunburn day. WHY ARE MY FEET SWOLLEN AND SHOULD I BE CONCERNED? Also my stomach, which is the worst sunburn ever, is hurting as if the burn is deep inside my stomach.