I have those thoughts all the time, haha. Usually they are not violent, except for the dentist biting (actually did bite the dentist when I was 4

)... I do think about what it would be like to go up to random people and say ridiculous things. Ask them if they are happy with their life, if they've ever questioned their sanity, if they've ever questioned their humanity...then tell them that I'm not human, I'm undead. Like a vampire or a zombie. Just to see their reactions. Sexual thoughts are also very common, especially when I'm on a high. Sometimes
everyone is just so hot, you know?! Regardless of gender, appearance, availability, health...

I think the thoughts are normal (though I am a bit biased). At least they are mostly harmless; I wouldn't worry about them.
I've also "heard stuff", though with the exception of one time, nothing clear. Coughs, laughs, music,running water, etc. I don't know if they are true psychotic experiences, and since they are so mild, I haven't told my pdoc because I'm afraid he'll think I'm overreacting (which is really dumb of me, but I really want him to have a good opinion of me, which is even dumber).
I don't think that your pdoc will want to hospitalize you just by the added weight of these symptoms. Like I said, the thoughts are harmless and probably very common, even in people without MI. The voices are mild as far as psychotic experiences go...if you were hearing a voice giving you commands, or making harsh judgments of you, your pdoc would probably be much more concerned. You still should let him/her know about them, however.
I hope that everything works out, and that you are able to avoid the hospital while still getting the care that you need.