What are the diagnostic possibilities and recommended immediate evaluation for an acute, first-time presentation of widespread urticaria and angioedema accompanied by abdominal pain, purpuric skin lesions, feeling of systemic heat, and visual disturbances that recurred despite taking antihistamines?
Your symptoms, including widespread hives, swelling, abdominal pain, and purple skin spots, suggest a systemic reaction, possibly a condition like urticarial vasculitis. Because these symptoms returned despite taking antihistamines and are accompanied by visual changes, it is very important that you seek immediate medical evaluation at an emergency department or urgent care clinic. Doctors there can safely evaluate your eyes, check your internal organs, and start appropriate treatments, which may include systemic corticosteroids. Please consult a doctor right away.