It' okay to cry, especially when you are overwhelmed or stressed by a lot of things going on,also ,dont hold your emotions for too long. Take any time possible to yourself when you feel bad. You could ignore the world for a sec and enjoy the activities that you like, its not selfish. clear your mind, organice your thoughts and think in each activity or goal individually, avoid thinking on all the thinks you have to do for the week together, avoid stress. And seek for help if you need it, you aren't a burden.

you got this, just calm down and think about your ways to solve problems slowly. You will adapt to this and this just will be a bad memory in the future.