I can relate to this and I know how debilitating and soul destroying these feelings are. But I am trying to avoid the words 'constantly' and 'always' because I can usually find circumstances where they don't apply, however temporary they may be. I am trying to figure out how I can re-create these more contented times. I also exercise and eat right because when I get out of this predominant state of dread I want to be healthy enough and live long enough to enjoy it. I suggest trying every avenue you can think of - therapy, meds, exercise, food allergies/intolerances (gluten and dairy can cause major fatigue), blood sugar issues, possible thyroid and hormone imbalances, work/life balance, toxic relationships to exit from, resolve chronic pain if present, etc etc. And recognize that everybody is so complex. It may not just be one thing. Follow your instincts as to the most likely problems and pursue those first.