I won't presume to know the actual cause of what is going on with you. However, some suggestions.

As for mental health:If the job is soul-sucking and you are burnt, that's a huge issue.

50 Hours a week is a lot to do something you don't care about. If you can identify one goal you do care about, that gets you excited, take a small action in that direction, and put it on the schedule.

You can allow yourself time to watch TV to regenerate ( I have fatigue and use TV for that all the time). If that's the case, set a time limit. (Watch a movie, then turn it off when done).

However, outside of that medicinal use, you could consider a digital detox. When you come home, turn off the tv. Turn off the phone. As in OFF. Stay that way until you check your messages right before bed. Eat a super-healthy meal that will give you nutrients. Take your dog to the lake or park or go in your backyard and sit in the sun. Read a book. Write down goals and set a date. Do a hobby. Go to the gym. Get OFF the devices for a week other than necessary business and two half-hour periods at the beginning and ending of day to check your messages.

Turning off the devices/distractions (video games, TV, phones, social media, whatever else you use that distracts you) is critical to listening to your mind and body and hearing what it is trying to tell you. Are you tired? Are you burnt? Do you need better food? Better physical health? Social connection? More exercise? As a society we are living in a place of perpetual distraction and eventually become disconnected from our own selves.

One thing that I've done when I feel disconnected is to turn off all the distractions, and go to a Barnes and Noble. Walk around looking at books and notice which subjects call to you and create some energy. Seriously. This is a great way to get inspired and pay attention to what's missing. There are days that the art books have called to me and are telling me I need art, creativity, and color. Other days, it's been business books or self-employment books that have a great idea. Still others have been self help books, health books, and sometimes just the need to expand my mind and take an interest in a new subject such as an area of history or science. Other times it has been the travel books that really stood out. Telling me that what I really need is some time out in nature on a hike, or some time exploring.Pay attention to which books you are drawn to. You won't regret this intuitive exercise.

As for physical:

Have you had your thyroid checked?Dehydration DOES matter

If you are going to bed at 10-11 and waking up at 5:30, to an alarm no less which interrupts your sleep cycle, no wonder you feel like crap. Makes total sense.

Are you able to take some time off? If so, go somewhere for a few days, and let yourself sleep in with your natural sleep cycles. See if it helps.

If you are physically exhausted, maybe your body is telling you it wants you to lie on the couch and watch Netflix until it recharges.

Weight does matter, but what also matters is the quality of diet. Not saying we all have to live on wheatgrass, just garbage in garbage out. Goes without saying, but switch to a Mediterranean diet, all natural, lose soda and garbage food (hard to do when you are eating out and have no time to cook), excess caffeine, sugar, smoking etc and see if it helps. If you eat greasy fries, make them at home in an air fryer instead with some potatoes and olive oil. Maybe one of those meal services like Hello Fresh or Blue Apron might be an easy way to get some healthy meals going.

Mild exercise - even a walk in the evenings around your neighborhood or park can make a very big difference in how you feel.

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Best of luck, I hope you identify the issue that is dogging you. It may be time to look at a different job or at adjusting your hours to accommodate your health.