Hi,
Your symptoms do not fit into the category of symptoms of how a gall stone presents.
Asymptomatic Gall stones are normal findings on an
ultrasound. You probably had a sudden muscle spasm or it could also be due to
Acute gastritis.
I am glad that the heart is normal.
Again, gall stones would not cause a fluttering sensation like the one you experienced.
Hope this helps.
Regards,