I can't stop crying for days on end. What do I do?

It might be time to talk to a therapist. Sometimes there's a stigma around therapy that you have to be really in distress to go to therapy, but people go to therapy for so many reasons, big and small. And it's not a lifetime commitment either. Try it. If it helps, great :)

a good idea would be for you to pay a visit to a therapist. That will help you learn what's on your mind that makes you so sad

Try relaxation methods. Write in a journal, listen to your favorite music, or do things that you did as a little kid. Or, just cry your eyes out and get over whatever you're sad about. Even when you've hit rock bottom, the only way to go is up!

Try and distract yourself... find something to try and occupy your mind and distract yourself from crying or feeling negative.

Although it is natural and okay to cry sometimes, it may be an indication of a more serious problem when it lasts that long. There's a possibility that you're suffering from depression or bipolar or another such disorder. It is best to talk to an elder about this and see a doctor. If it is not found out to be physiological/neurological, it could be psychological. It is a good idea to try to find the root cause or the trigger for you and find a specific cure for it. Moreover, i suggest you to stay connected with '7 cups' listeners as sometimes talking can make real difference. Hope it all soon changes for you and for the better. :)

Taking care of yourself is most important, especially when it feels impossible to do. It will help..

Think happy. Don't think about whatever is bothering you. Just distract yourself. Or you could try talking to that person about what is bothering you.

Find out why you are crying so much. And it is best if you talk to someone about it. Try to talk to someone you would blindly trust and someone who would understand what you are going through.

Find and connect with what makes you happy and pay extra attention on that feeling you got from it.

Take a piece of paper and write down all the things that you are sad of angry about. Now look at them, which of them bother you the most? Which seem solvable? Finally, write down possible solutions, even if you think you wont be able to carry them out. Do this every day, try to take tiny steps towards those solutions every day.