Is this normal? My arm joint area is twitching tremendously. My left arm where it bends (opposite side of my elbow) keeps twitching?

Abnormal.

yes, you need more minerals, the western diet is a nutritionally inferior diet, I use Bioplasma, but also take a mineral supplement at least every other day.....and you don't swallow the Bioplasma, the tiny pills just fit under the tongue and will slowly dissolve

It's probably a muscle spasm.

Find the muscle that is spasming out pressure in the middle. Keeping pressure applied move your fingers to the end of the muscle. Release presdure, go back to the center and do the same in opposite direction. That may help.

Regardless, once you start using it it will pass.