Red rashes and itching that appear after a fever and body pain may indicate an infection, an allergic reaction, or a viral illness. You should consult a doctor immediately for proper evaluation and treatment to prevent complications.

Since this has lasted ten days, it could be triggered by a delayed allergic reaction to a new product (like soap or lotion), a viral infection, or even stress. Because antihistamines like fexofenadine aren't helping, it is best to have a doctor or dermatologist examine your skin. They can provide a precise diagnosis and prescribe targeted treatments, like topical creams, to help you find relief quickly.

Swelling after a bee sting is common and usually due to a local allergic reaction. Apply a cold compress and keep the affected area clean to help reduce swelling and pain. Avoid scratching or pressing the area, as it may worsen irritation. Seek medical care immediately if swelling spreads, becomes severe, or if you develop breathing difficulty.

Since fexofenadine and montelukast aren't providing enough relief, your elevated IgE levels suggest an underlying allergic trigger that needs a closer look. I recommend discussing a referral to an allergist or an ear, nose, and throat (ENT) specialist. They can evaluate you for conditions like cough-variant asthma and may recommend targeted therapies, allergy shots, or a sinus CT scan. In the meantime, using a daily saline nasal rinse and asking your doctor about a generic corticosteroid nasal spray may help soothe your airway.

Since cetirizine already provides you with excellent 48-hour relief, it is a highly effective choice, though it can occasionally cause mild drowsiness. If minimizing sleepiness is your main goal, fexofenadine (Allegra) is the best option among those you mentioned. Fexofenadine is highly effective for urticaria and is widely known as the least sedating antihistamine. In contrast, hydroxyzine (Atarax) is very sedating, and Montex FX contains a combination you may not need. I recommend discussing a trial of fexofenadine with your doctor to see if it keeps you comfortable and fully alert.

Since oral itraconazole and antihistamines weren't effective, the next best step is seeing a dermatologist. They can perform a skin scraping, culture, or biopsy to check for bacterial infections, atypical yeasts, or inflammatory conditions like inverse psoriasis. For relief, they might suggest drying solutions (like aluminum acetate), topical mild steroid creams, or non-steroidal anti-inflammatory topicals.