Mama, please bring baby to the doctor as soon as possible, excessive crying, straining, and redness like that needs checking, especially kung ganito ka-intense. It could be reflux, colic, or something with the formula na kailangan ng expert to figure out properly, at hindi kami pwedeng mag-guess dito.
A few of us moms went through similar scares, at ang best move talaga was to get the pedia's take right away, kasi iba-iba ang reason para sa bawat baby, and what works for one doesn't work for another. Hang in there, mama, you're doing great reaching out!