Anapanasati Buddhist meditation So I thought I really need to ask this question about Buddhist meditation specifically, Anapanasati. Basically I sit cross legged and count breaths for 15 minutes as advised on the Internet for beginners. Correct me if I am wrong but I think I might be overdoing my breathing towards probably the last 5 minutes. The breathing becomes heavy and I work harder to take deeper breaths . And I feel some sort of stiffness in my mouth and neck. And at the end of 15 minutes, I wake? Or get up all giddy (probably due to the heavy breaths) and feeling something out of this world for a while like say a minute. 

Is this the way you're supposed to feel after doing a Anapanasati? Because it feels so odd probably due to the processes the brain undergoes during heavy breathing or rather forced heavy breathing. Would like some insights from meditation practitioners.
It is more gentle than that. Consider the first tetrad of anapanasati:

Breathing in long, he discerns, 'I am breathing in long';
or breathing out long, he discerns, 'I am breathing out long.'
Or breathing in short, he discerns, 'I am breathing in short';
or breathing out short, he discerns, 'I am breathing out short.'
He trains himself, 'I will breathe in sensitive to the entire body.'
He trains himself, 'I will breathe out sensitive to the entire body.'
He trains himself, 'I will breathe in calming bodily fabrication.'
He trains himself, 'I will breathe out calming bodily fabrication.'

And the second:

He trains himself, 'I will breathe in sensitive to rapture.'
He trains himself, 'I will breathe out sensitive to rapture.'
He trains himself, 'I will breathe in sensitive to pleasure.'
He trains himself, 'I will breathe out sensitive to pleasure.'
He trains himself, 'I will breathe in sensitive to mental fabrication.'
He trains himself, 'I will breathe out sensitive to mental fabrication.'
He trains himself, 'I will breathe in calming mental fabrication.'
He trains himself, 'I will breathe out calming mental fabrication.'

Emphasis are mine. These are strong hints.
From my understanding, stiffness, rigidity, force should be absent -- only the minimum should be allowed so one doesn't fall on the ground, or sleep; any small amount of extra effort disturbs the mind.