I suspect you will find sleep restriction helpful since the rollercoaster nights you described are a common symptom associated with allotting too much time for sleep at night!
You said that you wouldn’t be able to perform your job if you had gone in after a night of insomnia — can you tell us a bit more about that? What is your job? Do you truly believe that you would have been 100% incompetent because of your insomnia and been 100% unable to perform any part of your usual job duties?
Did staying at home after calling in sick lead to a better day or did it perhaps lead to more sleep-related worry and maybe a bit more fatigue due to less activity and fewer distractions?
You might find these videos helpful, too:
Rearranging your life around sleep only feeds your insomnia and makes the problem worse
The difference between chronic insomnia and sleep deprivation (and why it matters)
I hope this helps!
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