Hi all! Just saw my pdoc yesterday. Been suffering depression and trouble falling asleep. Made me get on a scale. I gained 12 lbs

He said there is a new rx that is a vitamin. It's classified as "medical food" and it's only available with a script. It is intended to relieve depression. I just started taking it yesterday.
Has anyone heard of this or taken it? My pdoc said it works especially good with
Lamotrigine, which I take 200 mgs twice a day.
Has anyone taken the sleeping pill zaleplon? I've read reviews but I don't know what is true or what the user's circumstances were, such as drug (prescription or otherwise) or alcohol use, dosage...things of that nature.
Any feedback would be greatly appreciated!