Aikido, been practicing it the last few years just before starting up my lifestyle with diet and fitness at 45/46.
Have you set up a diet plan yet? Calculated your calories? I assume you stopped taking the anti-depressant medication? What kind of medication was it?
Realizing the problem is the first step. The second step is taking the time to educate yourself on the things to do to earn your goal; most importantly along this path, you will learn a great deal about yourself and make adjustments as you go. You have it in you to provide "enough of you" to get this done to your satisfaction. Do not let yourself down. You can and will do this.
If you do not know how to calculate your calories (macros), I can help you with this.
Best regards,
Chillen