Lots of good input here already. Worth mentioning I started this medication class back in October, right as days started getting shorter heading into winter. By February, roughly where you're at now, I could barely drag myself out of bed. Just completely drained, every single day. That exhaustion improved gradually over the following months.
Try upping your intake of the sunshine vitamin and a vitamin C supplement, and staying properly hydrated. And give it time. It genuinely does get better, promise!