Some more hugs, dear Sona.
I know the exercise endorphins would help your mood, but pushing it when you're exhausted and in desperate need of time, especially downtime, will only continue the vicious cycle. Are there other mood-boosters you can recall helping you in the past, which you can make a habit of? Music, meditation, aromatherapy... whatever floats your boat, find it and immerse yourself, please --- regularly, like brushing your teeth, if not for long.
And while you feel how you feel, there is certainly no helping that, I know you're too smart a woman to believe how you feel about your body while depressed and medicated reflects the actual objective truth necessarily. I discovered this first hand, but you probably have your professional experience to remind you of this too --- yes, you're sad, and that makes you feel worse about being 'fat', which makes you sadder... even though you aren't fat and you know a few lbs is not the worst thing you could be dealing with by a long shot (you've survived much worse already, haven't you?).
Hang in there, Sona. You are fabulous today as you were a few months before and you will continue to be fabulous tomorrow, and the day after, and the day after that... Just keep reminding yourself (put it on the mirror, on the monitor, wherever) until you believe it and until the obstacle is gone.
I wish you better health in the long run, as well as a happier day today than you had yesterday in the short term (baby steps...)