Hello, I Have Been Having An Issue Which Is An

Hello, I have been having an issue which is an intermittant problem---again started tonight while at work----I have loose stools and frequent need to urinate. It begins with stomach pain---drink some water and take some Pepto to see if it will calm the acid in the stomach. I take Ranitidine prescription strength on a daily basis. Could this be the begining of an ulcer?