You know your body better than anyone else. You already know something isn't normal.
I've experienced several health problems and have learned that you have to be your own best advocate when you have a medical issue. Unfortunately, some medical problems aren't easy to diagnose, and in those cases doctors often basically blow you off initially. Many will only do further investigations if you return, complaining of the same symptoms again and pushing the doctor to figure out the problem.
The symptoms you are describing sound similar to endometriosis which can be difficult to diagnose, and can only be confirmed by laproscopic surgery. Of course there could be other possible explanations for the symptoms you are experiencing, and it's important to get to the bottom of it.
I'd suggest you return to your gynocologist, write down a list of your symptoms and when you notice them/what time of your monthy cycle they occur. If your gynocologist doesn't take you seriously and investigate, go to a different gynocologist who will investigate. Sometimes you need to see several doctors before you find one you are comfortable and will work with you the way you need them to.