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Do not use a handkerchief. Because it irritates your nose. You can use a soft or smooth cotton cloth. In these cases, you can do allergen testing and find out the things that are allergic to you. For now, you can take tablet Cetirizine 10 mg. It helps you a lot. This allergy does not affect your whole body. The pain in the right upper chest occurs due to muscle spams or sleeping in the wrong position or sitting in the chair for a long time. As you have mentioned that you have pain while bending and so most probably, it is due to muscle pain. You can apply Diclofenac gel or spray on that area of the chest or you can take tablet Diclofenac 50 mg once a day after meal for three days.