Sorry you have had/are to deal with such strange unidentifiable symptoms. It must have been quite worrying initially, but I'm glad that nothing serious has shown up. Hope it clears up completely soon.
I'm glad A&E ruled out anything more serious. Hopefully, it will clear up on its own. It could recur, though.
At least 85% of us oldies carry the cold sore virus (herpes simplex, HSV). Just like the chickenpox/shingles virus (herpes varicella/zoster, VZV), it hides away from the immune system within our bodies, and only breaks out when we are tired, ill, run down, or on immunosuppressant medication, such as prednisolone. Outbreaks can become more frequent as our immune systems weaken with age.
Pain on one side of the head or face is often caused by the virus 'reactivating' and causing a nerve to become inflamed. From personal experience, I know it can be excruciating. Sometimes, a cold sore will appear a day or two later; sometimes the damage remains unseen, beneath the skin, or inside the mouth or sinuses (inside the forehead or cheek). Then the cause remains an annoying mystery, unless a pattern appears.
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