What Causes Constant Fatigue?

hey, ive had this problem for a few years now but its only been getting worse. i m constantly exhausted I have a balanced diet. I try to exercise, but just getting out of bed makes me feel like ive ran a marathon. doing simple things like walking around the house or washing dishes takes it all out of me, and leaves me with no energy. my body feels drained all the time, I have regular sleeping patterns, but no matter how much I rest, I wake up fatigued, and this last s all day. I feel like I haven t slept in days and I find it hard to focus or remember things that have recently happened.