It sounds somewhat like psoriasis, especially the nail part. Do you have any lesions on the rest of your body (e.g. trunk, arms, legs, etc.?) It doesn't sound like what I've heard as complaints about MTX, which I have been researching for my own purposes recently. I am about to start MTX for SS myself, due to the inabililty of nonsteroidals, Plaquenil, and Evoxac to totally manage my symptoms. While I am more than ready for some relief, the other side of MTX have me concerned.