Agreed, meds do not normally give you a sore head. BHO should have a warning label (possible side effects: pounding headaches) I looked at a thread by a riu'er called VErde, holly shit those guys are talking some chemical shit over there, ISO butane, ISO propane, this that and the next thing.......gave me a little spew feeling as I read it, lol. swallowed it back though, haha.
And cof has about given you the recipe there Caanbiscult. Seriously the easiest thing to do. Crush up or grind up some bud, or trim depending on how flush you are). Put ground up stuff in a jam jar (I usually do it in 14-15gram batches). Pour the everclear over it so that it just coveres the product. Shake for a few seconds then pour the alcohol out of the jar and through a filter. I use a 120 micron. The alcohol is poured into a flat glass dish and then left to evaporate. Glass dish as the stuff that is left over can be scraped off. The more dryer you make it the more crystal like it becomes. You are effectively left with a cross between what they call "Shatter" or "hippy crack", and stuff that is a bit gooey(er). Some erl you can roll into a hash ball, some is just too sticky to touch. It will really depend on the product of course.
Here's a quick Erl video I made.
[youtube]4h7zhPxbr6c[/youtube]