For me it helps not to focus on any part of the head, and intead to focus in other parts like the abdomen like someone has already said. Also trying not to control helps to alleviate the tension

this post helped me, http://www.dhammawheel.com/viewtopic.php?f=17&t=10723" onclick="window.open(this.href);return false; especially the last comment , now i seat on the edge of the cushion in a burmese style and i can meditate for longer periods of time.
I hope it also helps you