Hi canagirl,

Sounds very uncomfortable!
I like the ice idea from mrsD, if it's tolerable for you.

Is it possible to reach your doctor? There are all types of topicals for the scalp.

Many people use topical steroid lotions for severe scalp itching and burning (skin reactions). I am not sure if these might work for your nerve pain. One used often for dermatological scalp burning is: betamethasone valerate lotion 0.1%. This is a prescribed product in the U.S.

Do you have, or have you tried, repeated daily applications of magnesium chloride or magnesium sulfate lotion ( Morton's Epsom lotion). I feel the key in trying either of these may be in using multiple applications throughout the day.

There is also topical lidocaine, which is sometimes use for nerve pain. This is a topical anesthetic.
OTC, Aspercreme (brand) offers a topical cream with 4% lidocaine as the only active ingredient.

(Higher concentrations of topical lidocaine are available by prescription.)

I do not know the potential adverse effects of using either magnesium chloride or magnesium sulfate lotion, or topical lidocaine (4% is max OTC) on your scalp.

Please consult with your doctor and/or pharmacist.
Your condition sounds extremely uncomfortable.

I hope you find relief pronto!

With Concern,
DejaVu

P.S. I know these options are not "home-made." They are available OTC, however, should you not find a home-made option. I find pharmacists glad to offer suggestions and some guidance, both on the phone and in person.