I have had most of these same issues, but my biggest problem is bloating. I will wake up in the morning with a fairly normal, flat tummy, but as the day proceeds and I eat meals my stomach begins to bloat. I have also noticed that I get full after very little intake and yet I get hungry not very long after. My stomach has been gargling and I feel like gas bubbles have been popping. I've also been belching quite a bit. I have had terrible back pain recently and the heartbeat in my abdomen is so extreme is has become fairly annoying whenever I am trying to sleep. I am worried that this is something pretty serious that I need to investigate more, but I'm also scared to find out...if anyone has experienced these same symptoms, please let me know if you've found a cause! I'm freaking out!