Tamoxifen may also be used to manage mania in patients with bipolar disorder. It also has an action of blocking the enzyme protein kinase C, which changes the neuron activity in the brain.
Current research suggests that this enzyme is overactive during manic episodes, hence it's relevant in the management of the condition.

Lamictal is a mood stabiliser. Abilify an antipsychotic. So nothing you're on specifically addresses depression, but everyone's experience is different, anyhow.

By the way, Charmed, welcome back. I hope you pull through this quickly.