I haven't slept well in two months due to family and work-related stress. how can i sleep better?

Take medication: If stress is continuous and you can't control yuor circumstances you might want to try melatonin or Benadryl (diphenhydramine) over the counter , also might be a good idea to see a therapist and assess your current life situation.

See a sleep medicine: specialist, your doctor or a therapist.Retire & rise same time each day. Keep bedroom dark & cool & use only for sex & sleep. Turn off tv. No naps. Exercise regularly but not in late evening. No caffeine for 6 hrs & no alcohol or tobacco w/i 2 hrs of sleep. Keep dinner moderate sized & finish at least 2 to 3 hrs before sleep. Can try warm milk, Chamomile tea or melatonin along w light reading.