Welcome to Just Answer and thanks for your question. Pain is not mentioned as a side effect of any of the medications you were taking. In fact, Darvocet, Neurontin, and Skelaxin are meant specifically to relieve pain, and Imitrex is for migraine pain. Celexa and Wellbutrin are for the depression that often comes with pain. I'm glad to hear you're feeling better, but puzzled as to why you would be. There isn't any good explanation for it.