I have found starting with a calorie defecit worked for me. I would make a doctor's appointment also because your symptoms of exhaustion could be caused by a slew if medical stuff. On days that I simply don't want to, or feel I can't, I close my eyes and tell myself to be where I want, it starts today. Do you have a family member or friend that could take a walk with you, or simply do a check in? I am ready for bed as soon as I wake up, so I got into pre work out powder to help give me a little pep in my step. It's not for everyone though.