Feeling sad and emotional, with headaches... 3.5 weeks post op

Does anyone else experience this? I've lost around 30 pounds in 3 1/2 weeks, which is wonderful, but the past couple of days I've had headaches, feel weak, and very sad and depressed. It's not time for my period (just past) so I don't know what is going on. I'm doing my best with food, but I know I'm not getting much as far as calories... maybe 300-400 per day. I'm taking my vitamins as I'm told, but can't shake this. Any suggestions?

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