Definitely call and even talk to the nurse in your dr's office. I don't think upping your dosage would be "overmedicating" yourself and, like I said, maybe Zoloft isn't for you and one of the other AD's would help more.
I know how you feel, in a way, about H and D. I had a kind of similar situation last night. My friend "Aunt P" came for the weekend. Last night, S7, was just bawling b/c she had to leave this a.m. saying "she's so nice to me." Of course, that makes me feel like sh*t, like I'm not nice to him or something, but then I told myself I'M HIS MOTHER, not his friend. Maybe it's not the exact same, but she's probably just going through a phase. H and I have a lot of times like that w/ our boys, where it seems they are closer to one parent than the other and you just can't let your feelings get hurt.
D still loves you no matter what! And your H may feel the same way about you and S at times, but doesn't necessarily vocalize it.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10