There's no simple solution to this.
We will have to analyse your gut issues in detail.
Anatomically speaking - stomach is in the top part of abdomen and bladder is in the lower part. So there should not be such symptoms. It is best you visit your nearest general physician for further examination and testing..
Sometimes undetected high sugars could cause increased urination and some stomach related issues as well.
Stomach burning sensations could be due to gastritis, ulcer , reflux disease etc ..
Kindly get yourself evaluated at the earliest
Next Steps
visit a general physician of your choice
Health Tips
do not self medicate based on your own conclusions , do not ignore your symptoms