"The last week, or so I've been doing these incredible shows, and from my pics, I look super happy and calm and collected. And I am happy, and sometimes I am calm. But the last few weeks my anxiety has been so f*cking intense! I can't even begin to explain."
He said that it was not the first time he had felt like this but he felt especially "hopeless at times".
"I've felt completely out of control and as if I'm going to snap and everything is going to come undone. However, for the first time ever I have been trying to really tackle and fight against these horrible thoughts and tidal waves of fear."
He went on to list some of the coping mechanisms he found helped, including Beyoncé.
He also posted a snap of a local fan listening to his music, which he said cheered him up.