Thank you for asking your query at DoctorSpring.
The right sided abdominal pain could be a number of reasons. From your description of the symptoms I think there is no danger or warning signs which warrants immediate evaluation. Abdominal pain symptomatically is often vague and seldom contributes to a conclusive diagnosis (Except in certain conditions). So the best approach would be to consider the common and possible conditions and treat them. In your case this pain could be due to a Ulcer peptic disease (or commonly called stomach ulcer). A mild viral gastroenteritis is another possibility. Mushy stool can occur in any of these condition as this can speed up the gastric emptying time. This is not a specific sign. I would recommend this approach for now :
1. Being peptic ulcer the most likely cause, you may take an OTC anti ulcer medication like Prilosec for 10 days in early morning once a day atleast 1 hour before food.
2. Avoid spicy and irritant foods
3. Do not skip meals . Eat at regular intervals.
4. If the pain still persists report your Doctor for further evaluation.
Hope this helps
Please feel free to ask followup queries.