Things I've observed and tried.
1) Seems like I have more itching (I'm 3b), if my food intake is a little higher in added phosphates, too much protein. Someone in another post suggested it was the phosphates. So, I back off on my protein for a couple of days - maybe 35 grams/day, instead of 50. Same with foods that contain natural, since I try to avoid added phosphates (it's tough, everyone adds it). It seems to clear up in a couple days.
2) Plenty of water to drink
3) Eucerin does help some.
4) See a dermatologist, they can provide some advice and likely prescription items.
5) My primary advised for me, ONLY IF, the itching is very intense, taking an antihistamine, Zyrtec for example. BUT at half the dose, don't want to stress the kidneys. And, only take it for a maximum of 3 days. So, I cut the 10 mg in half. I've also found topical antihistamines which usually contain the ingredient found in Benadryl (diphenhydramine). You can apply it locally to the skin. Although, I've found the itching often jumps around intensely. First the ankle, then the arm, then a leg, now the scalp. The topical doesn't help much in that situation. So, when it's that bad, I'll have to take a half dose of Zyrtec.
6) Cooler water temperature for showers, tough to do on a cold winter morning when you want that warmth.

That's about all that works for me. Each person is different, so talking with a primary care doctor is a good place to start. Hope you find this helpful. Good luck!