Parents do sometimes "go nuts," more commonly dads IMHO. My parents became meddlesome, then distant. But that was many, many years ago. After about two years they started focusing more on wanting me to be happy.
If they take it badly, it's important to understand that parents sometimes develop their own narrative of what their children's lives will be like (married, kids, grandchildren...) without awareness that they have done so. Instead, they make their narrative into "reality." A big deviation from their plans can seem almost like they have lost that child and they can be angry about that loss and the person who caused it, that would be you. I think that if you can see it from their perspective and empathize with them that this is an upsetting loss, it will disarm some of their anger which they may use to cover up the underlying emotion, which is sadness.
No matter how much advice you get, this is your decision and a difficult one. In my case, getting honest with my parents has, over the susequent thirty-two years (yes, I came out in 1976), has deepened our relationship in ways I never could have imagined. Good luck in your decision.
Dave