Yeah.. I agree! I can't imagine leaving my young kids for 4 days! I left Cyan for two days when he was 2.5 YEARS old with Grandma. I only did that because he has a very flexible personality and I knew he'd be fine. I still wouldn't leave Olivine for that long and she's almost 3.
It sounds like you have some good ideas now and that you two are trying to put things in perspective. As for your friend leaving her 6-month old for 4 day stretches... well, I don't envy that at all. That's the entire idea behind attachment parenting- being attached! Don't compare your situation to that one. I could say more about that, but I will restrain myself and be sweet.
I'm glad you made the decision to try antidepressants. Not because I'm saying you need them, but because I'm glad you are going to try something new to help yourself. I hope they help!