How are you doing, Tabitha. I'm typing solo so I thought I'd check back in on you.
2 25 mg of zoloft is a typical starter dose, so if you find that you aren't feeling any relief soon, you may want to consider going up to 50 mg. For most people 50 to 100mg are the typical doses, but I know moms who bf while taking 150mg, so don't let the dosages scare you. Take what you need to to get better. Also, it can take several weeks to start feeling any real effects from the meds. That in itself is frustrating -- the wait -- but it takes a while to get the seretonin functioning correctly again.
How are you coping with everything else?
Adding a second child can be extremely stressful. It changes your whole family, and it can be exceptionally scary because there will be times that it will change the way you feel about your oldest child. I have told this story before, but there was a period when my second child was around three months or so that I didn't feel the same about my oldest child anymore. I didn't feel like I loved him as much as I had before his brother was born. I was constantly frustrated with him. I felt absolutely terrible about the way I was feeling, like I had ruined his life, and our relationship permanently. It lasted for several weeks or a couple months then as quickly as those feelings came, they were gone. I started asking my friends who had their second children in the months around when I did, and found out that more than half of them (most of them actually) had gone through that very same thing, but were too embarassed to talk to anyone else about it. After all, mothering is always supposed to be wonderful and we should never have those feelings about our children -- right? Well, I found out it was wrong. Many, many of us go through feelings like that, it's just taboo to talk about it.
Try not to be too hard on yourself for how you are feeling now. I think the transition to two was hardest for me when my second child was between 3 and 6 months and started having his own personality. He was so sweet and charming that it was easy to see my older child as demanding and frustrating. Don't feel guilty about your feelings, just acknowledge them and know that they are normal will change soon enough. Change is the only guarentee we seem to have.
Let us know how you're doing.