I just finished taking Letrozole for five days to get ready to do IUI this cycle. It was my first time to take this drug and for the most part it was fine, a mild headache here and there and a few zits that came out of nowhere - maybe coincidence but I really never get zits ever anymore so I assumed it's the change in hormones from the drug. I stopped taking the drug on schedule on Sunday, and then yesterday I developed the most awful headache that still hasn't quite left. It was worst during the night, I barely slept and felt feverish. It's still there but much duller now. It's going away slowly but I wondered if anyone else has had something similar?