Do not tell your sisters about that plan, it will be too much.
About the depression part, in my personal opinion,
it will be best to only tell a few sisters. Those few sisters who you can trust and has shared some secrets of their own. This is a fragile issue, and may not be the best idea to share it with the whole chapter, yet.
And, about the meds. Is there a reason why you are skipping them? If there is a reason (i.e. side effects) talk to your doctor and maybe he can adjust the dose or switch meds. If there is no reason, take them! Withdrawals from anti-depresants are no walk in the park and can make you feel even worse, mentally and physically.