What you describe sounds like widely known symptoms of depression, but it can also have a non-psychological reason, e.g. a metabolism or nutrition problem, or physical exhaustion. I would definitely schedule a general medical check-up with a doctor and then as you talk, mention the issue to him or her. Your country's health service, or your insurance, may offer such yearly checks at no cost.

Meanwhile, until the appointment, you can try a behaviorist trick that is known to help. Come up with a few in- and outdoor activities you like (or at least don't dislike), and schedule specific time for them in the morning and noon hours. These don't have to be purely leisure activities, but they also can be very simple. Then try and stick to your plan for a few days, even when you're not feeling like it, then see if you want to add or change something in the schedule.
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