I received cosmetic botox injections and there was itching at the injection site immediately and I had a headache for a couple hours. The next day I took a warm shower and got very itchy on my face, scalp, under my arms and the outside portion of my ears. After I got out my face, ears and scalped had a very strong burning feeling that lasted 3 hours. I did not use any new products while showering. I strongly believe this is related to the injections. How long do you think these symptoms will last?