Who should I reach out first? Psychiatrist or Psychologist?

Hello po, nabasa ko po kasi sa guidelines na magkaiba yung psychiatrist sa psychologist so I was wondering who should I reach out first. For background, this would be my 2nd time going and nung una kasi nagreach out lang ako sa teacher ko nung shs and nirefer niya yung psychiatrist na kakilala niya which I booked an appointment, had sessions, got prescribed medications, and eventually, parang hindi siya ganon ka-effective sa'kin (yung talking session/interview lol kasi ang laki ng age gap like nasa 60s na sila lol) na parang yung med lang talaga nakakatulong so I stopped and unfortunately, that Psychiatrist died 2 months after. Naghahanap ako currently na nasa same age range ko (I'm 20) and seeking for guide rin po here. Life is currently falling apart and I can't take it anymore.