Awwwww I am so so SO happy and VERY PROUD of you ... you're probably crying because you worked so hard all day and exhausted.
Try not to stress... it's understandable, but try and think of all you've achieved today.
Oh and I like how you coped on the subway... good thinking, I may try that.
Enjoy the rest of your stay, take care of yourself and remember that we're all thinking of you.