A.R.
A., I can totally relate to being overwhelmed. Especially the guilt about calling in. My kids are alittle bit older now and I have to call in less frequently, but when I do I still feel alittle bit guilty. However my childrens health is way more important than a job. Luckily I have tended to gravitate towards jobs that have been flexible and family friendly. But even then I hate piling my work on other people. I have found that finding someone at work who is in somewhat a similar situation with taking days off for personal business, and making arrangements with that person to handle things for them in emergencies, and they can reciprocate for you when you have emergencies Also keep the line of communication open with your supervisor, like just briefly stepping into their office and saying "just want to warn you, the baby was very fussy when I dropped her off at day care, so I am preparing myself for a phone call." Then before they can say anything, let them know your "just in case plan" That way your boss knows that your work is still a priority. It helps when people are not surprised when you are rushing off to pick up your child.
Don't isolate yourself right now. Thats the worse thing you can do. Make the time to dial up family or friends and get how you are feeling off your chest. It really helps. My freinds and family are a huge support system for me. Sometimes just knowing that they understand what I am going through is helpful enough to get me through a bad day. And shamelessly solicit their help from time to time. You are not wonderwoman after all. I wish you the best of luck.