Thank you so much for you reply James! I'm sorry for not replying sooner my computer was getting fixed. I hope you get to see this post. Can you please give me an idea of what kind of tests you'd recommend?
I recommend starting with a general blood profile and try to get a scan, such as an MRI. These can narrow things down quite a bit.
By the way, has the pain decreased at all? Anything making it better or worse? Does it come and go or is it constant? Do you have any weird feelings such as feeling your heart beat in your abdomen?