It’s getting close to meet time. how crucial is this meet anyway? BTW Rub Aspercreme Forte or Flexal 454 combined with heat rub on the hamstring, cover it loosely with plastic wrap (like part of a garbage bag, put on your sweatpants and sleep with it on overnight and see how it responds (you can do that each night for several days. Did you try the ZMA?
If it doesn’t feel better, you need to consider staying out of the meet.