This may be a bit TMI but I don't know what to do. I have been taking prescribed codeine for 10 days now for dental pain. I eventually got the treatment required and won't need the painkillers now, However I have a horrible pain in my stomach. I really need to go but nothing will come despite 'sitting' for ages. I need a quick fix. I've been drinking lots of fluids but am struggling with the pain in my stomach. Any ideas please