When I shared very briefly with my boss, she was genuinely concerned that I was getting help with it.

At work, it is work performance that is what is important. That can include the tasks a person is responsible for as well as decisions made and interactions with others at work and clients. That is what is measured, evaluated.

I don't share much in the way of personal things at work. If I had a blog I would not want that to be open to my employer and co-workers. If I had a blog and I knew my employer had access to it, I would no longer feel to write freely. If I was in your position, I would password protect the blog to lock it up and begin a new one at a new site. I would do this because blogs tend to be very personal, very in the moment, and can so easily be misinterpreted.

That's what I would do, but I am me...and you are you.