OUCH SUNBURN!!?!?! HELPPP?

I got sunburn on my back on monday. everything was fine it was just burning and i cant sleep at night because it burned.but today i woke up it was fine untill i went outside rollerblading with my friend. i second i walked outside my back with itchy and it felt like needles or pins were poking me in my back and like bugs were crawling all over me.we rollerbladed a little and it hurt sooo muchh. i got home took a cold shower and then put on aloe vera cooling gel and it didnt help. then i put on the aloe vera cream & nothing it stilll itches and i have the poking needle feeling and ive tried everything. i put sour cream on also and NOTHING! i cant take this anymore. im panicking pleaseee helppp meee and make this feeling STOP! i dont know what to do anymore!