We were in ocean and suddenly something felt like it bit me in stomach. Shortly after started feeling joint pain in lower back, knees and elbows. Then instantly felt sudden head congestion. Like and allergic reaction to bite? I took Benadryl....now what?
Hello, Welcome to Chat Doctor, As you suddenly developed the symptoms of allergic reactions like itching all over the body following some bite, it may be allergic reaction to that. As you developed the hives immediately after that and reduced after the anti histamine Chat Doctor.  If the symptoms are coming down nothing to worry, if the symptoms are increasing you have to consult to confirm whether you are having allergic reaction are generalized eczema. Thank you.