NEW Primary Circuit

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I've been doing NEW for about 5 months now.  About a month ago I started to finally work on the primary circuit.  When I first started this I could only get the base an navel primary centers, then I started feeling drained.  Now I can easily get energy up to the throat center.  This week I was having a particularly energetic day, so I decided to try to raise energy up to my brow center for the first time.  This went alright at the time.  However, the next day and the day following I had a splitting headache; it gradually faded.  Being one not prone to headaches that often, I'm a little worried that I either tried to raise energy too soon, or maybe fed too much energy up the first time.  I was wondering if anyone else has experienced this and whether I should be worried about it.  Any advice would be helpful.

Kyle