I don't know if it is the same feeling or not but some of the members with thoracic outlet syndrome {TOS} have had muscle spasms and it can involve or irritate the nerve that runs around the chest.
Many have gone to ER to be checked for heart attack because of the sx.
But it always turns up to be spasms and the nerve and not the heart.
sx are racing heartbeat feelings, rapid & shallow breathing, coughing, heart beat is very noticeable to the person affected.

I haven't read up on the MS hug feeling, so it may feel different than the TOS spasms.