Inhale screaming help?

Ive been working on exhale screaming for a while now and my screams have been geeting higher and louder but i cant get the hang of inhale. When i inhale it sounds really really crackley almost like a scream except its not vibrating fast enough, so if anyone could give me some pointers on that, that would be great. and also, are inhales just for pig squeals or are you supposed to beable to speak words?