Letrozole reaction

I’ve searched everywhere to see if someone is experiencing the same side effects as I. I am COVERED in rash like lesions from my neck to my knee caps. It started immediately after my first cycle of the drug and was only on my neck and arms. It has now spread and is horrible!!!!! My doctor said try Benadryl and calamine lotion, but I need this gone ASAP! It’s 4 am and I can’t wait to storm into their office. I don’t think she believes the severity of my discomfort. Will post pictures later. Anyone else have this side effect?