It's about my yahoo mail *I can't access my yahoo mail account. I know my password but...

It's about my yahoo mail *I can't access my yahoo mail account. I know my password but instead of getting my password it's says i'm not sign in on any yahoo app and that i should use an alternate way to sign in and keeps on saying to verify my account by sending me a verification code on my old number. But the problem is i don't have access to my old number i'm using a new number and another problem is my alternate email. I also know my password in my alternate email but it says : we've noticed some unusual account activity. For your safety verify that it's really you signing to this account, again by sending me verification code send to my old number which i no longer have access to. How will i open my yahoo account. All my apps are connected to that account. This email address is very important it's my very first email account and all of it all my important emails ,even my facebook is connected to it and also i can't open my flickr because of it. Please help