Personally I never found citalopram strong enough or depression and anxiety but my depression is pretty severe right now. I found an SNRI antidepressant much better but citalopram is generally safe for use during breastfeeding and being the weaker of the SSRI medications, it should have the least "zombie" like effect on you.
I found that antidepressants helped me to feel as depression made me very numb and distant. It depends on the dose and how severe depression is in comparison with anxiety
There are a wide variety of medcations you can try, one that is very good and effective (also SAFE for breastfeeding) is Wellbutrin/bupropion as it aides weight loss and helps increase your energy levels too