There are a ton of home remedies but this is something I know works and will at least let you sleep at night.
Before going to bed run hot water, as hot as you can stand, over the area where the rash is. Then pat dry. This will immediately stop the itching and will last for up to a hour. Usually, it will give you enough time to fall asleep. You can also do this during the day for some needed relief. While you should use very hot water do not burn yourself and do not use water hotter than that that comes out of the hot water tap.
I feel your pain. Never had poison ivy until in my 50s and now I can look at it and get it.