Jetlag and melatonin isn’t working

I just got back from vacation where time zone is 15+ ahead (I’m in Vancouver, Canada). It’s been a week and I still can’t sleep more than 3hr at night. I’m very tired around 11pm and thought I’m gonna sleep till morning or at least 6-7hr like before. Instead I wake up at 3,4am every day and my head is dizzy all the time till I get some sleep again. It’s exhausted and I can’t focus on anything 100%. I took 1 tablet of Melatonin before sleeping every night and still woke up at 4am. Should I increase it by 2 tablets ? I’ve been traveling before but this is the first time I got jet lag this bad.