Hi, I also have been suffering from the same symptoms. I did pretty research on this and think you might want to have a look at this link.
Oops,sorry correct link is
Sorry for the really late reply. I hope that you no longer have the problem. But if you do may be I can help. I have been suffering from the problems for more than 7 years now. I gave up looking for the solution 3 years ago. But recently I could not take it anymore. So I gave it a try one more time. I came to the US this year and consulted a doctor here. I have undergone a test called defecography and diagnosed with Anismus. It means the puborectalis sling is contracting when it is supposed to be relaxing. It is a weird condition and tough to treat. Please reply me with what is happening with you.