I would still call this an MS hug. I have "hugs" which do not wrap completely around me. This is because MS does not have to affect both sides of your body. I am glad you got checked for any cardiac concerns.
You might try cold compresses to see if you feel better or a dip in a cool pool or a tepid shower. OTC's are probably going to have zero effect if it is MS. I still get MS hugs, but I dismiss them as annoyances. At one time I thought they were excruciating, but no longer. Hopefully you can build up to that point too. Stay strong!