hi I am currently taking 20mg of cellebrex and 20mg of rovostarin ,I am experiencing itchness from my shoulder and down almost to the wrist ,dry mouth and skin ,would this be caused by the combination of the two or by one in particular ,I take the cellebrex for mild shoulder joint pain and mild arthritic pain in the thumbs ,the itching axtends around my shoulder blade and is causing a mild rashalso my back itches when I get up in the morning (could be heat related from being in bed)can you advise please?