I was a bit inspired by this site so today I thought, bugger it, I'm going to try and tell my boss, as he's been fantastic when I've been unwell (physically) lately.
So I did. And it went really well! I said, I am not a delicate little flower and I can and do cope. I do not want you to be different to me and I want you to expect my work to be good just as you always have done. And I will never take the piss. But I am telling you this because sometimes I find things hard and then I need you to trust me if I have to take some flexi time or whatever.
He was great. He said people in his family had suffered with depression and he whilst he respected my privacy and wouldn't bug me, to come to him if I needed anything and he would try and make sure from a work perspective I was as supported as possible.