/ic/ - Artwork/Critique

I've been feeling incredibly tired and depressed lately and I can't get my brain to work right for drawing. It's like slogging through mud, or squeezing blood from a turnip. My synapses just aren't firing. A lot if it is because of sleep deprivation due to my shitty work schedule and other life obligations colliding, but that isn't all of it. I'm horribly depressed and have almost no physical, emotional or mental energy. I'm drained and tired all the time and I have to pound down ridiculous amounts of caffeine every day just to be able to function.
After fapping I seem to feel better for a little bit and my brain gets kicked back into gear for a short time, could it be that I have a testosterone deficiency? Would it help if I took up an exercise regimen? I just want to feel happy again, feel motivated to better myself. I want to live, bros.