Suffering Ongoing Right Abdominal Pain Radiating Under Breasts, All Tests Are Non-conclusive. Any Ideas ?

I have been suffering ongoing right abdo pain since before Christmas 2012. I describe my pain as follows: right in the middle of my breasts, radiating underneath my right breast, more increased pain down my right side, radiating into my stomach, going through into my upper right back / shoulder. I have been back and forth to the doctors. I've had numerous blood tests / stool samples / 2 ultrasounds, the first one came back inconclusive, and I was told that maybe I had a non-functioning gallbladder, the second one came back completely negative, nothing wrong at all, no sludge, no stones, gallbladder looked healthy etc. I've also had a gastroscopy which returned negative results too, everything absolutely fine. I'm now currently waiting for a follow-up appointment with my consultant, but I get this pain pretty much every single day. It only occurs at night time, anywhere from 6pm onwards, and always lasts anywhere from 4 - 8 hours. I take 2 buscopan, 2 codeine and 2 ibuprofen, but these only really take the edge off and I think they just end up knocking me out. I can't lie down as the pain increases when I do so have to sit bolt upright. As the pain always appears more so in the middle of the night I am not sleeping at night. I have a 4 year old son to look after, and at the moment, with this pain, my life is pretty much hell. I don't know what to do anymore. The consultants secretary said the next appointment she could get me was 21st August, which means another 6 weeks of pain before I get to see the consultant again. I've said that this is now not good enough and I can't be expected to suffer every day with this pain, not sleeping etc without it being sorted. Please, any ideas, is there any light you could possibly shed? Thank you. AAAA