I just started taking it as well. 20 mg.
I feel really strange, no nausea, just weird headaches that pass quickly. Feel kind of disinterested and detached from things as well, and having trouble sleeping.
I am normally very excited to go exercise, but I haven't been to the gym all week because I feel so tired after work. I keep forgetting to eat. Sometimes I feel really unfocused.
Hope that it gets better because I feel worse than before I started.