Sorry for the long post but I have tons of experience with this and hopefully this might help someone:
First off, if you're going to go on meds just get a script for adderrall. It'll %100 solve the tiredness and the motivation problem. But honestly there's soooo much natural stuff that can help.
For the past 10 years I've tried EVERYTHING, even the most obscure shit out there. I actually just got back from a trip to south america where I spent 11 days doing native medicine. Ayahuasca, peyote, san pedro cactus, yopo, Alvarius toad (5-MeO-DMT), and Kambo frog.
Things like Kambo frog can get rid of depression and addictions. It literally changes your brain chemistry.
I've been on most SSRI's and could never tell if they were working so I always stopped after a few months. I didn't get any side effects when starting or stopping abruptly, I was on the max dose of Wellbutrin (Bupropion). It's the most stimulating SSRI but I stopped taking it cause it wasn't helping my anxiety. If you're gonna go down the prescription route I recommend bringing that up.
After there was nothing less for me to try I went to see a new doctor who put me on Zoloft which I agreed to take because it's one of the best SSRI's for anxiety and after struggling with benzos for years, I knew I had to go the SSRI route. I've been on it for 6 weeks and i'm doing much better. I only took it because I'd exhausted all other options and I can't take benzos for the rest of my life.
You should take Maca root for overall energy. You can get them in capsules for pretty cheap and definitely work. There's nootropics like phenylpiracetam and adrafinil, etc.
And finally, I know this sucks to hear but although whatever you take will help your energy levels, the real problem is being unmotivated. It's the hardest part because you really have to work hard to get out of that rut. You gotta be disciplined and force yourself to do shit you don't want to do like going to the gym, skating, whatever. If you put in a month of hard work i'm sure you'll get your groove back.
BTW, if you do take an SSRI you'll probably feel worse (more tired and unmotivated) at first. Also consider that it can worsen depression in some people.