Have you ever taken tegretol for bipolar disorder?

My doctor decided to put me on 400mg at night and that made me sleep basically a full 24 hours. I went down to 200mg and I’m still really weak and have no energy. Most people seem to start at 200mg but is there a lower dosage? What are your experiences with this and other bipolar meds? I just wonder how many more medications I’ll have to try before one actually works.