Большая беда молчит, а малая кричит

People plunged in great grief keep silent about it See Легкое горе болтливо, тяжелое - молчаливо (Л)

Cf: The deeper the sorrow, the less the tongue hath it (Br.). Great griefs are mute (Am.). Light sorrows speak; great ones are dumb (Am., Br.). Little griefs are loud, great griefs (sorrows) are silent (Br.). One who complains the most suffers less (Am.). Small sorrows speak; great ones are silent (Br.). Secret griefs are the sharpest (Am.). Sorrow is /always/ dry (Br.). They complain most who suffer least (Am.)