Things that can cause my patience to run out or that put me on tilt include, folding marginal hands in mid-position that would have won me a large pot, being dealt nothing but rags for 2 hours then when i get AA everyone folding to my big blind, winning several hands in quick succession and thinking i am untouchable, players winning and showing a liking for weak or marginal hands so i lower my starting hand requirements and get caught out.
The list above is about only poker, we have other issues that can affect our play, things in our day to day lives, like family, financial or professional problems.
The more we play the better we become at controlling our mental attitude and this can be of use in our non-poker life, this said we will all have bad days when things seem too much and these are the times when the decisions we make can be suspect or we may feel as though things cannot get any worse and decisions we make are not important, this is a mistake, the decisions we make in these times of stress are at least as imporant as the daily choices we make, i would say more important. In poker this is shown more clearly and we immediately see the results of our poor decision making. The players who can see they made a mistake, learn from their error and not allow the fact they made a mistake to affect their future play will have greater success.
Good luck buddy.