I think I broke my circadian rhythm. I'm now waking up before the sun even comes up. How to reset it?

Takes time . Jet lag recovery takes time, some say a full day for every hour of time zone change to fully recover. Use morning coffee, daylight exposure and exercise to maintain alertness and try and stay up until "bed time" at your destination (even if destination is "home"!).
Bright lights. Try a checklist of activities aimed to help you received bright lights during the daytime until 2 hrs prior to go to bed: open blinds during daytime, buy a therapeutic bright light box to expose your eyes to at least for 30 min/day. Avoid caffeine containing beverages and food after 2 P.M. Darken your room as much as possible. No computers, tv sets, or digital alarm clocks in your bedroom.