I am 55 year old male. Over the last year i have had some health issues and diagnosed with prostate cancer. All blood work has been normal. Digestive issues with constipation. For whatever reason, i have no appetite for any fatty or greasy foods,  lost about 30 lbs. I have been to 3 gastro doctors that tell me its IBS...just take over the counter laxatives. No further test or prescriptions. With all of this i have lost all my interest and cant concentrate. I used to plan for the future but lately can barely plan a week ahead. Was putting the max into 401k for most of career but now wonder if i will even need a retirement savings. Going to look into some antidepressants to see if it helps me both mentally and physically.  My mother passed away of lupus when i was 1 year old. Maybe a midlife crisis thing...such a dramatic change in my daily life.