Let's suppose someone is making you to go haywire and you're going to get furious. You are about to warn them grinding your teeth regarding your character and say that you have a long fuse and can keep your temper for a long time, but in spite of this ability of mine, I need to warn you that if I get angry, I would get in a very bad way in the manner that I can even harm you etc. I was wondering if you let me know whether the following sentence sounds natural and idiomatic to convey this message:
I usually don't get angry, but if I get, I'd get badly.
I need to know if the usage of the adverb badly sounds natural and idiomatic to you or I have to substitute it with something like very angry etc.