Anxiety - Need advice on the using sammy

Hi Doctor, I have been dealing with generalised anxiety disorder for about 10 months. During the course of 10 months I had been trying various cognitive behavioural theraphy and supplements to cope with my anxiety. I could not achieve 100 percent success from CBT alone, so I was trying some supplements like St.Johns Wart and then sam-e. Currently I am trying sammy(Wockhardt) 200mg once daily. It has been a month I am taking sammy. After first two week, I really felt a huge difference in my ability to control my anxiety. I was able to think clearly. I was able to better control my obsessive thoughts. In short I felt like I am myself again after a long time. But for the past two days I am not able to sleep properly. I feel like my brain is not tired to sleep. And I am not able to sleep for the whole night. I feel it is the side effect of sammy. Can you advice me on any approach to deal with insomnia because of sammy. Thanks.