How to handle toddler tantrums?

Mommas, I need some help. My son is 2, and he is the absolute worst when it comes to anything. He screams, to the point of turning red, kicks, slaps, throws himself against the tile floors, walls, bites. If we tell him no, he’ll go and hit his little sister in the face as if it’s her fault, pull her by her hair, drags her by it, puts her in choke holds. Hits us in the face. He has left three bruises on her head by throwing cups. I’m completely at a loss.

We discipline as best we can, but nothing has worked. He cries for a minute and goes right back to misbehaving. I have no clue what else I can do but hes getting worse. Could this be a deeper issue? I was thinking of getting him to see some kind of specialist but I have no idea where to even start.

Therapist? Behavior person? Please help! I’m almost due with another baby, & his sister is picking up his bad habits. I’m afraid they’ll end up hurting the new baby