I'm sorry you're dealing with this. I know all too well the awful effects of hysterectomy and there's nothing like your own ovaries! :(
You've only been taking the Premarin for 3 days, not nearly enough time for it to raise your estrogen levels to make a difference in your symptoms. You need to give it at least 2 to 3 weeks to even see some improvement. And even longer to see the full effects and decide if you need a higher dose, lower dose, another hormone, etc.
Although progesterone can help with sleep, it may not be needed once you get enough estrogen into your system. And some women cannot tolerate progesterone due to that "hangover" or drowsiness effect. And it can dampen the effects of estrogen causing symptoms of estrogen deficiency.
It's best to get your estrogen delivery route and dosage "settled" and then add another hormone(s) if you want to try something else.
I know it's hard to know what to try and when because of all the horrific effects of hysterectomy.