Feeling down, tired of life, distressed, some sleep disturbances during working days, some weight gain and have rare suicidal ideation.am i depressed?

Depressed??: In my opinion you need a full physical with labs including thyroid panel to rule out somatic cause then if normal i would get referral to mental health professional/psychiatrist so you would benefit from therapy as well as antidepressant medication. Also please note you are not depressed but a person who may have a depressive episode.

Depression: Your description does sound like you could be depressed -- suicidal ideation is definitely an alarm sign. It would be a good idea to see your physician about this to start checking your overall health. More definitive treatment can come through a psychiatrist and/or psychologist. Both psychotherapy and medications can be very effective. If suicidal thoughts increase, be seen in an er.