I think it depends on the batch. I have add nu-nu in the past and never got headaches. This time, I got very mild positive effects (such as the relaxed, tranquil state) but a great deal of negative effects (headaches, nausea, fatigue).
Anyhow, I tried to reach this visionary state, but no luck. I think the fact I had low quality nu-nu, played a role in why I was unsuccessful.