Genji main here, tbh you should just hunt down a med pack, especially if you're fucking around, its a bad idea for the healer to leave the team for a Genji, If you really need healing "you" should go to the healer and not the healer coming to you ! When i play Sombra or Genji i always go for the med packs so my team healer focus on tanks or heroes that defend the point while im trying to push back the enemy team !