Since fexofenadine (Allegra) and Calsoft lotion aren't fully relieving the itch, your body is having a strong allergic reaction. Please stop using all sesame-containing products immediately. To soothe your skin right now, try cool compresses or a lukewarm bath. I highly recommend visiting a doctor promptly; they can prescribe a stronger generic antihistamine or a short course of oral corticosteroids to quickly calm the inflammation. If you experience any swelling of your face, lips, or difficulty breathing, please seek emergency medical care immediately.

Since you are already taking fexofenadine (Allegra), your inhaler, nasal spray, and Pulmoclear, let's focus on soothing your airways. Try elevating your head with extra pillows at night to reduce post-nasal drip. Running a cool-mist humidifier in your bedroom will keep the air moist, and sipping warm water with honey before bed can naturally coat and soothe your throat. If this persistent cough continues to disrupt your rest, please check in with your doctor to review your medications.

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 fexofenadine (Allegra) is no longer helping, you might try cetirizine or loratadine, which are effective, daily non-drowsy antihistamines. The skin darkening you are experiencing is likely post-inflammatory hyperpigmentation, a common and temporary response to skin inflammation and scratching that typically fades once the itching stops. To soothe your skin, cool compresses or a mild hydrocortisone cream can help. Consult a healthcare provider to safely adjust your treatment and ensure you find lasting relief.

Nose and eye irritation from allergies can be eased by avoiding triggers, using saline nasal rinses, and keeping your environment clean. You should consult a doctor, who may recommend allergy medicines or eye drops for relief.

It sounds like you are experiencing an allergic reaction, likely contact dermatitis from the hair treatment chemicals. Since you have already taken fexofenadine (Allegra), this should help reduce the itching. You can gently wash your scalp and hair with lukewarm water and a mild, fragrance-free shampoo to remove any remaining chemical residue. Applying a cool, damp compress or a mild, over-the-counter hydrocortisone cream to the affected skin can also provide relief. Please avoid scratching to prevent infection. If the rash continues to spread, or if you develop swelling in your face, lips, or have any difficulty breathing, please seek immediate medical attention.