This is a tough article for me to read too, as I've just started a very necessary first-time SSRI (Celexa) myself. My educational background is in research, and I've read a lot today about SSRIs and breastfeeding. This study, like all others, relies on VERY small sample sizes (there were only 10 people on zoloft, and 5 were male) and in this case the data were not focused on breastfeeding mothers. To put sample size in perspective, in educational research we consider samples less than 30 to be case studies; real "significance" isn't really obtainable, let alone generalizable. But medicine is different, so we have to take their findings for what they are. It bothers me a great deal that there aren't larger more appropriate studies, but these drugs weren't developed with BF in mind. What I have found is that regarding zoloft in BF moms/infants, some studies (again, with very small samples) find evidence of zoloft passing through breast milk, most find that serotonin reuptake is NOT affected in the infant, though trace amounts (really, very small) of the SSRI are apparent. It's still considered one of the safest choice for BF mothers/infants.
I've been nursing for almost two years, and I can't believe the difference in my mood and demeanor with my kids in just two days. Personally, I feel the benefit for us outweighs the risk, though in all honesty my daughter will hopefully wean in the next few months and I'll have less to worry about.
That said, I've also found some info on mercola.com that high quality omega-3 oils can have a wonderful antidepressive effect, and I would encourage you to read more about it. Mercola recommends krill oil, as it balances antioxidants (which help eliminate cancer-causing free radicals) with omega-3 fatty acids. I believe you could safely take it along with the zoloft, and see whether you feel any improvement in the anxiety you still feel; maybe it would help your anxiety over the cancer issue too. You could potentially switch from taking an SSRI to taking krill oil, if the effect is strong enough to help you. Only one way to find out, right?
It might be hard to find a good source though - I haven't gotten that far in my own research. Mercola of course wants you to buy his brand, lol, and I know some people find him less credible for that reason; but his information typically aligns with what I've read elsewhere.
Quitting an SSRI cold turkey isn't usually good for you - but you can wean off gradually with your doctor's help, and maybe try some more natural remedies (I wonder if St John's Wart would have the same DNA effects as an SSRI?). I've been down that path too - vitamin D, lots of the B vitamins, omega (though not krill or SJW) - I still need the extra support :( At least for now, the SSRI is doing much more than I could do on my own, and far less expensive.
I am NOT an expert in this, I've learned a lot in a very short time - but I hope this helps!
As for me, I logged on tonight to ask whether anyone has taken zoloft while nursing an older baby (mine is almost 2) and noticed side effects. I am noticing some side effects in her currently (I am taking citalopram/Celexa), she is more irritable and is having trouble falling asleep at night - but she is also growth spurting and teething, so it's very hard to tell what the cause is! Like you, I want to blame the new meds, but it's only been a couple days. I also don't like the reports I'm reading about cardio complications with Celexa. My inclination is to have my doc run an ECG and compare it to a recent (healthy) one I've had, to see whether anything has changed. But it would be just as well to switch to one without that complication.
Having a love/hate relationship with SSRIs right now! Good luck to you Mama!