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Regarding what you mentioned,

the diarrhea may be a side effect of this medication or it may be due to infection of the gastro intestinal system.

What are the investigations that should be done in the case of gastric ulcer ?

• The doctor will do a test to rule out H-pylori or infection of the gastric mucosa.
• The doctor may do an endoscopy and biopsy to rule out the possibility of malignancy.

What the medication that can you use ?

You can use drugs that suppress the production of gastric acidity such as omeprazole

What are the therapy of this case ?

This case is treated with application of anti fungal preparation such as miconazole or the use of anti fungal tablets .

What should you do ?

You have to visit your internist doctor so that the doctor could do a full clinical evaluation of this case then he will treat it accordingly .
  Stay well.   
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