Thanks for the query to H.C.M. Forum.
First of all want to explain you that this is not a GUILLAIN-BARE syndrome.
Neither it is starting of this syndrome.
Symptoms of GBS are usually sensory and nerves involvement.
As you have mentioned you age as this is very important . Endoscopy
is very important to rule out any disease in stomach, as it may be ulcer.
2nd reason may be due to high blood pressure
Some times due to high B P patient feels bloating
in stomach with fullness and mild degree nausea
. ( as in your case).
3rd reason may be due to overeating .
Tension , stress
, fried food, coffee or tea( in excess) may be another reasons.
Consult one more physician and get his opinion and think about the diet habit .