Any dispensary will sell you a vape cartridge. For what you describe, I suggest an indica or an indica hybrid. Can you get out to a dispensary? Or is there an accessible one in your area? If you can't get out, many dispensaries accept phone or online orders. Many offer "curbside service" . . . in case you need someone else to go get it. Some will even deliver.
Strains that worked well for me for pain (including nerve pain) were:
Pennywise
Cannatonic
AC/DC
Your dispensary will have other suggestions. Or, you can go online and search.
Start slow . . . [...] a puff or two. See what it does. Everyone's different so these [...] not float your boat and you will have to try other strains. I strongly suggest that you go online and read about the medicinal uses of mj.
Best to you,
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