If you or someone you know may be experiencing a mental health crisis, contact the 988 Suicide & Crisis Lifeline by dialing or texting “988.” When Pooja Mehta’s younger brother, Raj, died by suicide at 19 in March 2020, she felt “blindsided.” Raj’s last text message was to his college lab partner about how to divide homework questions. “You don’t say you’re going to take questions 1 through 15 if you’re planning to be dead one hour later,” said Mehta, 29, a mental health and suicide prevention advocate in Arlington, Virginia. She had been trained in Mental Health First Aid — a nationwide progr…