I hope you figure something out that isn't to physically exhausting to do.
It sounds like you need some rest... Maybe getting up early today can help you get into a better sleep pattern?
It sounds like your day is really full, and I get that it beats sitting at home crying (have several of those t- shirts), but maybe you can make it an early night and take your meds to try to sleep earlier than usual?
The tears need to come out, too. It will stop much faster this time.
You were not naive. You trusted a person you had decades of history and a committed relationship and even a legal contract with. If a business partner of 25 years suddenly took all the money in the company account and flew to Aruba, would you blame yourself? If a woman was raped by a friend she had known for 20 years,would you blame her?
You cannot have a relationship without trust. It's one of the cornerstones. It's not your fault that your WH has emotional problems, or that he is dishonest, or that he lies.
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17