As human grow different types of incidents flow with him. At different aspects of life we all face hardships, struggles or sorrows and then it all started to fill in us which makes us so heavier from within.
At some point it become so heavier that our heart can't take it anymore or should I say we can't deal with it anymore. But we mostly don't pay attention to it rather we keep going like this.
We keep telling ourselves that how strong we're while in reality we're at the edge of verge because this so called world told us that we've to be strong no matter what, we can't cry and so on.
I think if you can't keep it together much longer let it flow. Allow yourself to cry to fall apart for sometime and you know what crying makes your heart lighter and to me it's nonsense that crying is a sign of weakness.
The most important thing you should do is turn to Allah and ask for His guidance and blessings and from there you'll surely get calm and peace.