Mental Health: At the mercy of my mind

I left work early yesterday, an uncommon thing for me. I felt ill in so many ways that it must surely be genuine. As the day and considerable sleep passed, it became apparent that it was not viral or such, but originated in stress, depression, and probably a number of other factors that created illness as a warning, I must assume. I am not doing well in managing my mental or physical health and the impact is getting more evident. The future is uncertain in terms of what the next step might be. Exercise, certainly, would help with both, but there are so many factors left to deal with and no immediate solutions.