Should I decrease the amount of time I practice concentration meditation? I have been following buddhist practices for little over three years now, and samadhi - or concentration, as you prefer - meditation was obviously part of my practice. As I was often taught from some of the books from which I learned meditation, I used samadhi meditation as a way of stabilizing my mind and of being able to do insight practices, beyond just getting more relaxed.

One of my primary concerns after having exited the "bubble" of samadhi meditation after a long time is that I feel that some of the daily-life difficulties that I was somehow able to attenuate with concentration meditation are now reappearing, although with much less strength. More precisely, since when I needed to decrease the time for samadhi meditation I have been experiencing more mood swings, a little more anger, sometimes even a bit of depression, but at the same time I also felt more connected with the environment around me. Just a few months ago, when my samadhi meditation routine was more strong, I kind of avoided part of the suffering surrounding myself by making use of my concentration abilities.

This left me wondering whether I should try to tackle some of my personal problems through insight or other practices in a more definitive way, rather than trying to avoid them by shifting my concentration to more tranquil places. I am not at all against consistently practicing concentration meditation, but sometimes it takes more time than I have; also, I think to have heard time ago the Buddha criticizing a routine composed of just samadhi meditation. Actually that seems a reasonable recollection, since the elaboration of the four noble truths and of the noble eightfold path from the Buddha seem to be oriented toward solving the problems of existence in a more definitive way, while, as I was taught, the jhanic states are only temporary and shouldn't be considered otherwise.
Concentration meditation is only a tool to temporary suppress your problems and hindrances.  It is not a self-contained technique for eradicating them.  This was one of the Buddha's great discoveries - an obstacle that he saw past when he was under the teaching of Uddaka Ramaputta and Alara Kalama.  Concentration is only valuable insofar as it aids in insight practice.  As the Buddha says, “When my concentrated mind [in the fourth jhana] was thus purified, bright, unblemished, rid of imperfection, malleable, wieldy, steady, and attained to imperturbability, I directed it to..." (MN 36.38).  The malleable and clear mind that you enjoy following samadhi is not an end in itself but needs to be directed back to the world of form.  That includes all of your mental hangups, psychological issues, etc.  The techniques for doing this are vast and include everything from mindfulness practices to Zen koans.

Ultimately, concentration meditation and insight practice go hand in hand.  They add value and support to each other making either practice greater than it would be on its own.  You don't need to abandon samadhi practice.  Just make sure you are using it effectively.