@skye Oh dear. I ran into your thread on my federated timeline... I didn't know it could get that bad. I'm sorry that this had to happen to you.
How long were you at your office job, if I may ask?
I was lucky earlier on in my life, because our schools were in changing shifts, one week we had school in the morning and one in the afternoon, so I could catch up on sleep. I, like you, kept skipping my early morning classes in university. I went on to have a PhD, which again had flexible hours. Then when I got a 9-5 job I started getting physical symptoms, though they were very mild compared to yours. I stopped two years later and moved to a WFH job with semi-flexible hours, and since then I'm OK.
Lately I discovered the combination of light therapy in the morning, with a full spectrum light in my office if I can't go for a walk, and melatonin in the evenings. I still don't wake up early enough for a 9-5 job, but I'm not a complete zombie when I occasionally need to wake up early, plus my working hours have a bigger overlap with my colleagues'.