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.

Given that your cold and sore throat have persisted, getting a COVID-19 test is a very sensible step. Even without a fever, mild infections can present this way, particularly with public transit exposure. While Avil (pheniramine) and steam inhalation can help ease congestion, they won't treat an underlying virus. I recommend taking a COVID-19 test for peace of mind. Please wear a mask during your commute, stay well-hydrated, and consult a doctor if symptoms worsen.

Yes, you can take Avil 25 mg, which contains the antihistamine pheniramine, to help relieve the itching and soothe your skin. It works effectively by blocking histamine, the substance causing your allergic reaction. Please be aware that pheniramine can cause drowsiness, so it is safest to take it before bed and avoid activities like driving. For extra comfort, you can apply a cool compress to your stomach. If the rash spreads, becomes painful, or does not improve within a few days, please consult a doctor for a thorough evaluation.

A recurring, itchy reaction like this is often urticaria (hives), which can be triggered by certain foods, environmental allergens, stress, or even a recent viral illness. To prevent another flare-up, try to identify any new exposures from last week and avoid them. Keep your skincare simple and avoid hot showers. Since levocetirizine and Avil helped, keep them on hand. I highly recommend keeping a symptoms log and consulting an allergist for targeted testing to identify the exact trigger.

Since this antihistamine didn't help, the rash may not be a simple allergic reaction. It could be triggered by contact dermatitis from a new skin product or fabric, a mild viral rash, or a localized fungal infection. Please try to avoid scratching and keep the area hydrated with a gentle, unscented moisturizer. I highly recommend consulting a healthcare provider or dermatologist for a quick physical exam.

This reaction, often called a vasovagal response, is quite common. To prevent this during your next vaccine, please stay well-hydrated and eat a light meal beforehand. Crucially, inform the nurse about your history of fainting; they can administer the vaccine while you are lying down. Plan to remain lying down for 15 to 20 minutes afterward to keep your blood pressure stable. Regarding your reaction to allergy medicines like Avil or Citrazin, these can cause drowsiness, which might mimic feeling faint. Discussing this with your doctor can help find non-drowsy alternatives.