I have posted my magnet information for years here. They are very useful, but require some care in their use. Some people are tempermentally not suited to using them safely.

But if you feel you could follow the warnings, and store them safely away from children and pets, they can be very helpful.
I use my two pads, that I made myself every night. I find I only need them for 20minutes or so...because I used very high gauss neodymium types--one inch in diameter.

This is my thread:
Using Magnets for Pain

Amazon sells plastic coated ones now, and those are helpful for
spot applications. They may be best for your purposes.

Right now Amazon seems to not have the coated ones...but Ebay has these:
1 Pieces of 1x1 8 inch Grade N42 RARE Earth Neodymium Disc Magnet Epoxy Coated | eBay

I also have these at home:
3 4"x 1 8" Disc Red Green Plastic Coated Neodymium RARE Earth | eBay

What the magnets do is change the flux of ions across the nerve membranes that carry pain signals. Much the same way that lidocaine does. (without the numbing).

You would use plastic medical tape (like NexCare) to apply the magnet to the skin. You don't have to wear it/them all day and night, as they are very strong and seem to block pain signals for a while when you take them off.

You need to study an anatomical diagram of where the nerves are that go up the back of your scalp. Sometimes you have to move a magnet around to find the "sweet spot" where it works best for your specific need. They have 2 poles, S and N, and if one pole does not help or increases sensations, you just flip to the other for the calming of sensations. The red and green ones are handy for remembering the poles. I have some little ones with dots on them, which I use to mark new magnets when I get them. The dot is designed to go towards the skin.

If you buy raw metal versions of the one inch neos, you have to cover the side the metal goes towards the skin, because you may get a "magnet burn" otherwise. I just put the tape on both sides. I made my pads from knitting needle covers, and sewed them in tightly because they are so strong they will not lie flat.
(I put heavy nylon stays in with them so they are bendable but do not snick together by themselves.

All this sounds like a lot of work, but once you get the hang of them, they can be truly very helpful. Another poster here, Brian uses them too. But he doesn't post here that much anymore.

I am always here if you have further questions, etc.
Be aware that some of the links on my old thread may be inactive.
The two Ebay offers I have on this post are active today.