Actor-comedian Alex Duong 's death is putting a lot of emotional and financial stress on his family ... TMZ has learned. But loved ones are rallying around them. Duong's very close friend and GoFundMe operator Hilarie Steele tells TMZ ... the mounting medical bills from Alex's cancer treatment could add up to $500K or even $1 million ... putting a lot of pressure on his wife, Christina . Hilarie tells us the family is hoping the crowdsourcing page could kickstart a college fund for their 5-year-