I went on a weekend RT course where you spend 2 days with bunch of people who are having exactly the same problems as you not matter what level they are at in the PPL.
I thoroughly enjoyed it and a had a really good laugh. There will always be somebody on the course a lot worse than you (usually
)
At the end of it I had completed the RT written, oral and more importantly, a lot more confidence on the radio.
Good luck anyway, out