Itch started 3days ago--spread fromfron abdomen,under breast,completely around mid section to back and under arm pits--wont stop--have assisted showers ,,changed soap,,powder with corn starch,,used zeaford,creams for itch--drink lots of water(main drink hot water with lemon---on many medications for thyroid,h,b,p,--gamabentin,,hydromorph for chronic rotor cuff 0strio arthritis and rheumatoid arthritis---is diet affecting metabolism of medication?