I guess that although you can make some downtime and definitely the nutrition and exercise will help but you also need to be honest about your job and role. Al

I guess that although you can make some downtime and definitely the nutrition and exercise will help but you also need to be honest about your job and role. All the self-help in the world won't work if either you are not well-suited to the role you are in, and are therefore becoming stressed or otherwise the work environment/management is toxic and doesn't suit your personality or expectations. Even when I am tired, I can get into my work because it inspires and challenges me and is within my ability level (but isn't too easy as to be boring).