Switching from EBF to formula (milk reco)

Hi momma's! Hope all is well po sa inyo. Hingi lang po ako ng tulong kung sino nasa same situation ko na need mag introduce ng formula kay baby kasi babalik na po ako sa work. My baby is turning 5 months this November at exclusively breast fed po siya and we've tried S-26, Similac, Enfamil, Nestogen, Bonna & Lactum for the past months pero umiiyak lang si baby kapag natikman na. Hindi po ako makapag stock ng bmilk kasi mahina na milk ko at malakas lang kapag direct latch. Any suggestions and recommendations will be much appreciated. Thank you! #workingMom #EBFBaby