I took zoloft while nursing my ds1, then through pregnancy with ds2, and nursing him. He is still nursing, but I weaned off of the zoloft after 2 years.
It was great. I am very glad I took the meds. I needed them, and they did their job. I am actually considering taking them again during the cold months, because they help me when there is less sun outside. I have anxiety and OCD which goes along with trouble sleeping.
There is nothing to worry about taking an ssri. If you need it, please go ahead and take it.
You may have some insomnia when you start taking it, or you may feel sleepier. You may feel nauseous and you may have some diarrhea. You may have more anxiety initially. But this will all go away in less than a couple of weeks. You may have a headache initially, too, but this is rare.
None of these things are anything to worry about, they are just your body adjusting to the meds. They will go away.
Once you adjust, you will notice that you are able to relax at night. You can fall asleep. You can smile.
The biggest thing I noticed was that my kids smiled more. Why? Because I WAS SMILING AT THEM.
If you think you need meds, you probably do, and they will help. They help more with therapy, though, so try that, too.