Thought I'd come back to this thread just to give some feed back on the Imipramine. I am now on 150mg a day and I'm tolerating it really well, the only side effects I get are dizziness on standing up to quickly or bending down and i get very sleepy for hour a few hours after taking it.
I have also stopped having panic attacks, although I still get anxious in the morning, but on the whole I feel that Imipramine is giving me my life back.