If you have been sexual active then you might consider that you could be pregnant. I have a friend that was very overweight went to the doctor with similar symptoms and found out that she was in labor. She had no idea that she was pregnant, she didn't gain weight, have morning sickness, or even look pregnant.
Hi
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It could be gas, polycystic ovary, muscle pull, nerve impingement, kidney stone or even infection of the gut. Take Omeprazole empty stomach in morning and an antacid gel at bedtime. Refrain from smoking, alcohol, fuzzy drinks, caffeine, and spicy food. Walking around also helps clear gas. If it does not help, consult a doctor. Take care!