day before Army Half Marathon

Tomorrow is the day.. Amry Half Marathon is just less than 24hr... Been training for it but injury had came and find me too... just few weeks ago, i pull my right hamstring then follow by the left hamstring.. omg.. this year isn't a good year for me... injury is one after another... shit... well got to improve the way i run so that i can stay injury free... getting nervous... will i be able to do my personal best tomorrow?? last 21km is 1hr 53min... wanted to do sun 1hr 50min but my hamstring just don't free that good...