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It might sound weird but apart from the standard advice you are going to receive about pills, therapy and mental gymnastics, in my personal experience becoming more spiritual helps.

I know its not a popular thing in a any tech circles to even think about it but it does help. And spirituality need not involve any religion. You can try philosophies like Zen or Advaita which basically reduces you to being a doer aiming for the best way to do things without caring for the outcome. These philosophies reduce the attachment to material success and paradoxically also help you do your best on any given task because your mind is free.

Its like you are a plumber or electrician who got called for consultation. You give your best possible advice and try doing the best possible work but if the customer faces the problem again, you might not feel the pain personally.