I have experienced the same symptoms, although not quite as badly (waking up very early), for the last two years. Take this with a huge grain of salt, because most of what I tried didn't work all that well, but I'll let you know what I tried with at least modest success.
And, if you ever figure out how to get your sleep back on track, I'd be grateful if you'd message me and let me know what worked!
-- Weighted blankets: I got one, and this seemed to help a little bit.
-- Cool bedroom: it's recommended to set the temperature to 68 or below.
-- Consistent sleeping times. Go to bed at the same time every night (if you can).
-- Limit activities in your bed. No TV, internet, smartphones. And no lying in bed wishing you could sleep. If you don't feel sleepy, then get out of bed, go do something else for a little while and then maybe try again.
-- You might check out CBT-I -- cognitive-behavioral therapy for insomnia. (Some of what I suggested above is part of this.) In general the most widely recommended therapy.
-- Keep up exercise and your social life, even if you're tempted to cut back (as I was).
Good luck! (Contact info in profile.)