I'd say you need to talk to an individual therapist and maybe couples therapist too, if you both can agree on one and have the time and money. You need to get to the root of what's driving your problems and both of you need to work on communication skills.

Also, before you started on Lamictal, did you remain on Abilify? Are you still on 5mg? That's a pretty low dose for that medication, so you may want to consider increasing it. It also may not be the right med for you in the end. How much Lamictal are you on now?