I worked at a place where abuse of sick leave was a huge problem. We were protected by a union though. When I needed stress time I took it and told them I had a migraine.

Previously, I'd never missed a day of work and they noticed my increased use of sick time. I was counseled on it once. Then I went into my first psychotic episode and ended up on disability. They don't question my use of it anymore.

IMHO, if you need breathing room to take care of yourself, and it won't affect your work environment, I think you should take it. The only person who takes care of you is you. Only you know how much you can take.