Since your just on Lamictal maybe a short term stronger mood stabilizer or even an AP for a few weeks can help knock back the anxiety enough for you to learn new ways to slow things down at night.

Sometimes taking a hot as you can stand shower often wears you down to where you can push a side a nighty ritual you seem to have.

Mainly just keep flinging coping skills at the mess until something sticks .

Im sorry your under so much stress right now , It will get better