First of all , let me assure you that an incidental finding of a small cyst
of the spleen
is not of concern and your symptoms are not from that.
Burning sensation and also pain occuring at nights do suggest acid
problems. I am not sure if you have had any X-ray or endoscopic
studies of your stomach. I am sure that they have ruled out gallstones
after the ultrasound
medications very rarely cause
gastrointestinal side effects such as nausea
, not severe abdominal pain
If you have done any travel outside of US, like Mexico or Far East, a stool
examination for parasites is a good idea.
Hope this will help you,
Wish you well