Don't rinse acv

Yes.
Leave to your head. It has lot of stuff that your scalp can use and the smell goes away, especially if you sleep with it.

The itching and feeling of burning is because your scalp is infected. Is somewhat wounded.

If your scalp was healthy acv wouldn't burn.

But don't overdose so as not to afraid. Use a cup- mayne 4-6 oz with 1/3 acv , 2/3 water. Massage your scalp after your final rinse and leave it. Don't rinse.

At first will burn. But as acv will fight the infection you will see that the same quantity wont burn.

Try it at every hairwash. When your scalp will be healthy - no burn at all.