we will need more details from you..
what do you mean by MS?
or multiple sclerosis?
Atrial fob . is a significant condition and occurs due to various reasons and needs detailed evaluations.
it can be life threatening.
if you could post details of inv. done so far, i could offer some help.
else, it is best to see a cardiologist and get worked up.
pl. keep me posted . and do not delay evaluation... good luck