Thank you for posting your query.
The strange sensations below your rib cage
could be due to benign fasciculations, that is, twitching of muscles in that region. These are not abnormal and there is no need to worry about them. They could be related to exhaustion of tiredness
If similar symptoms recur or involve other parts of body, then, you would need to consult a neurologist
I hope it helps.
Please get back if you require any additional information.
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad,
My personal URL on this website: http://bit.ly/Dr-Sudhir-kumar
My blog: http://bestneurodoctor.blogspot.com/