Welcome to NeuroTalk:

I am sorry I don't know much about testing, as I only had one
EMG of my arms a LONG time ago.

But for your hypertension...I will ask if you are taking an ACE inhibitor drug? I am recovering from a severe drug reaction to
my long term ACE inhibitor use of over a decade. There were many "fainting" feelings, strange sensations when bending over, and many muscle spasms all the time. This was due to an overabundance of bradykinin, which builds up in some people, taking these drugs. The ACE inhibitors were developed from snake venom, which causes a bradykinin reaction, and shock in victims bitten by the specific viper studied. In some people, there is a lack of the enzyme to degrade bradykinin, and with time it can build up causing all sorts of full body sensations, and derangements in blood flow.
Capoten, Vasotec, Lisinopril, Accupril, Altace, are some of the common ones.

So first off if you are using one of these, get to the doctor ASAP and get that changed. Your global, symptoms might correct themselves if this is a problem.

If not, then we move on to other potential issues. Others here can address your testing experience and will be along eventually.