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Do you have a workout/fitness routine? I've always found that helps motivate me to do things like eat right and sleep well
Do you have a lot of stress at work with long hours and maybe even work on weekends? Do you have little to none rest from the stress? Is this maybe going on for a while now?
If the answer is yes, you might be showing first signs of a burnout or something similar stress-related and you should consider seeing a doctor about it. Happened to me not long ago and I had similar symptoms (among other signs).
Do you get enough sleep?