Welcome Garrett,
Since you are suffering from depression your first priority needs to be your health. Have you seen a doctor to rule out any physical problems that may be contributing to your depression? Medication may be in order as well- at least temporarily. I suffer from SAD (seasonal affective disorder) which makes the short dark days of winter miserable. Read about the disorder and see if that my be a factor for you.
Meetings and other JW activity makes depression worse. Stay away from that toxic environment!
Finally, please, please don't make important decisions while in a depressed state. Rather than send a letter of resignation which can not be undone, take this time to learn and heal. Be sure to read the books Londo suggested.
All the best to you