Dehydration or something else?

i haven’t been drinking the recommended amounts of water in 3 days, (8 glasses), usually i drink about 2-4 glasses now. I used drink about a half gallon before. Some symptoms i’m experiencing are : confusion, muscle cramps, fatigue, dark urine. sorry if this is such an obvious question i’ve been paranoid about a lot of shit lately
Dehydration or something else?
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