Have a conversation with your manager for mutual benefit.
Dreading going to work is one of the lousiest feelings a person can have. Many people—perhaps including you—don't recognize that such a feeling may be more than what it seems like on the surface. There is a good chance that it is a symptom of not being mentally well.
That dread is a symptom that something inside of you has taken its toll and made functioning day-to-day at work something that you feel is impossible to achie