Help! 😭

I've had itching for a while now but the itch I have now is unbearable. My hands, feet, arms, legs, belly, EVERYTHING, itches so bad to where I'm to the point of crying or pulling out my hair. I do not sleep at night, and when I do I wake myself up scratching.  Cold showers do not work. Oatmeal baths do not work. Benadryl does not work. I've read where itching this intensely could be a sign of cholestasis. I'm just wondering should I go to the hospital and be checked out? I called the doctor yesterday and they suggested Benadryl which like I said does not help. My next appointment isn't until 5/27. I'm 35+3 weeks. I just want some relief.