Casi el mismo significado sin embargo la primera expresión se usa en Latinoamérica, la segunda y la tercera se habla en España

Es lo mismo. Son sinónimos.

I don't usually answer many questions but your 2nd Law profile pic caught my attention ;) (I'm a huge Muse fan by the way) The 3 of them are more or less the same. I guess "No the enojes" would be more appropriate in South American countries, as here in Spain we don't use that expression much. "No te enfades" would be the usual "don't get mad". "No te alteres" would be more like "don't get upset", it implies a sudden change of behavior. But really if you ask anyone, they will say they are virtually the same. I hope it helps! :D