I've used SAMe but there's no studies about it being used in pregnancy or breastfeeding. A B complex is good too.

A couple of other things would be to ensure you've have a blood test to test things like Thyroid, Iron etc.

If you've had side effects or withdrawal from SSRI anti depressants, I wonder if you'd be better on another type, like the old Tricyclic, MAOI, or a RIMA (Aurorix) instead?

I would mention your concerns to the GP. You might be better to see a Psychiatrist or go to a public mental health clinic, as they have a much better knowledge about different anti depressants, than GP's in all honesty.