Welcome to the AYP forums.
Blocked throat is one of the most common problems.
Since you have been doing this for only two weeks... I would say give it a bit more time. After you are stable a bit with practices you can try Chin pump :
http://www.aypsite.com/plus/139.html and spinal bhastrika :
http://www.aypsite.com/plus/171.htmlBut please don't add them yet, wait at least 6 months to be sure you are stable in the core practices.
The headaches, do you have them during practices or after? Also, reduce spinal breathing if the headches become too much.
Also, when I was suffering from headaches, the one thing I had realized was how much I lived in my head... next time you realize you are thinking, see where your attention is... if it is in your head, bring your attention down into your chest area or stomach and think from there. It takes some practice but it's not hard after a while... this takes a lot of pressure off your head.
Hope some of this helps.