HI ! It is good that you have thought of starting on a healthy diet for correcting your weight.Initially you may try a proton pump
inhibitor and a prokinetic agent. If your bowel habits are normal , you should go for an ultrasound
of the abdomen to exclude any abdominal pathology like your query on enlarged spleen
. This can be also excluded with clinical examination, for which you will have to get yourself reviewed by your family physician.