Obligation to observe the commandments of the rabbis in a place of great sorrow

There is room for leniency in certain cases, as the poskim wrote in the prohibitions of the rabbis, there is room for leniency in cases of great need/sorrow/loss. Each case is individual and I cannot answer this in general. But if I still have to give a general answer, I would say that it is incumbent upon us to overcome our sorrow and the obstacles in our souls. As the Rif and Rosh write in Mok 16 that there is no halacha according to Rabbi Eli (let him wear black and do whatever his heart desires), because everything is in the hands of Heaven except for the fear of Heaven. What concerns the fear of Heaven is in the hands of man, and he is obligated to overcome and not surrender. But as mentioned, there are situations that may be seen as great sorrow and alleviated.