Being productive is an important part of life, though there isn't anything wrong with taking time off being productive to deal with an illness or build skills.

Being productive is an important part of life, though there isn't anything wrong with taking time off being productive to deal with an illness or build skills. I'd suggest focusing on self-care and getting your depression under control. Most people with mental illness will have it all their lives, its about getting it to a level that doesn't prevent you from enjoying life. Having no motivation and feeling exhausted are pretty detrimental to enjoying life. Although you said you are training to be a military reservist which sounds like it could be a great opportunity.