my son started breaking out in a rash/welts on his thighs and legs, complaining about feeling tingling all over, sore all over, weak and not feeling right. He went into urgent care today and was told it was polyneuropathy and pruritic erythmatous rash. He was given gabapentic, suffamethoxazole and terbinafine. He took the meds two times and is now complaining about his chest hurting, the rash is now spreading up his body to the middle of his stomach and neck. Should I take him to the emergency room?