Wouldn't I foresee this coming?

I was telling my friend in office that I started to feel stressed again. He asked, wouldn't I foresee this coming?

One of the reasons I told him is that I have difficulty in thinking long term. In other words I have the tendency to say and to decide taking something based on my feeling at that point of time instead of thinking whether I can do it in the long run.

He asked further, does it mean that the pains in the past were not painful or not enough to encourage me to avoid it? That was a good question. Somehow it seems that although I have now the habit to write, I seldom review it. I have an excuse by saying that I do not think it help. But it is still the fact that I have not tried to have a regular time to review and to extract lessons for making decision in the future.

Another interesting point of view was on the discipline. I have the tendency to exceed either the time limit or the number of tasks to do. For example, I often already know that let's say I can only have four things to do in one day. So the suggestion was to really say no to the 5th thing. I was reluctant as that would mean I need to say no for the incoming tasks that are not planned. But again which one do I choose? To become stressed again or to maintain healthy life?