I Have Poison Ivy, Which Turned Into Cellulitis. Treatment Is

I have poison ivy, which turned into cellulitis. treatment is clobetasol, keflex, and prednisone, plus various OTC treatments. It is improving, however the incessant nocturnal itch is overwhelming and haven't really slept in a week. Have tried Advil pm (2 tabs), and benadryl 50mg...to no avail. I take a cold shower at about 3 am to help stop the itch. Any other suggestions. My guess is that it just has to run it's course. Thank you, Barb