Question: In the last couple of months, I have experienced a chronic headache in my forehead and after checking with doctors etc nothing could be found. I then kind of had the intuition it could be related to my meditation practice. It's more the 2 years I meditate daily for 20/30 minutes or more. I have come around some articles online reading that focusing on the breath (especially in the nostrils, which I used to do) could lead to an accumulation of energy around the third eye chakra, and it seemed to me my pain felt exactly like this. I have now taken a break from my daily practice and the headache got much better and nearly disappeared, but as I stopped meditating I really miss the peaceful state of mind and presence I had when I meditated daily, so I would like to start again soon. I would be so grateful to get tips from you on this.

Answer: 
The Buddha did not teach to observe breathing at the nose tip. The Buddha taught to simply let go and give up craving. Just sit quietly and naturally. The mind should be "open" rather than "focused".
If this is indeed a problem with forcing your eyes into a strenuous position to maintain focus somewhere, I've found a way that allows me to have my eyes rest, while still having them act as a center of focus.

* Reach your hand out in front of your eyes, with you eyes open.
* Focus on the position of your hand in front of your face, and learn to "feel" that position.
* Once that's comfortable, close your eyes (with your hand still outstretched where it was), and again, focus on the position of your hand without seeing it.
* Once you can easily focus on your hand without seeing it, lower your hand, and again focus on that same area; now occupied by empty space.

I've found the empty space in front of my face to be a very relaxing place to focus. I often use this to help me fall asleep. I haven't tried transferring this over into meditation (I really should practice meditating more), but I can see this technique being applicable.