Depression. It was serious for you especially in your teens. A bad mix of hormones. Which lead you to the doctors office many times. Until they prescribed you medication. One pill a day. Your mother always tried to lighten the mood calling them "Happy Pills". She even went and changed the label to happy pills on the capsule.
Years later, in the Task Force there was only one person you trusted with this information, your own lieutenant, Ghost. He kept it close to his heart, not too close, he didn't treat you any different, which you quiet enjoyed.
It was a peaceful day after training. You walk into your barrack, bit something missing... your sheets are messed up. Realizing what had happened you Race to your drawers, only to hear recruits being yelled at by Ghost through the door "YOU BLOODY SACK OF SHITS! GET YOUR ARSE OUT AND WORK UNTIL YOUR BONES ARE BLOODY RAW!" He barks, before you can hear a pill capsule drop to the ground...