The word "crazy" is a layman's word -- it doesn't even have any meaning in psychiatry. So don't let that word and its connotations worry you -- you don't sound like a candidate for a straitjacket!
As Bonnie, said, it sounds like you may be dealing with strong anxiety, which can cause the hostility, obsessive-compulsive thinking, and overreaction to minor annoyances that you describe. And as Megagene said, the giddiness you describe could indicate a bipolar aspect, as well.
Yet you're being treated only for depression, and some antidepressants don't do much for anxiety (believe me -- been there). And if the anxiety is being generated by a bipolar issue, even an anti-anxiety medication won't solve the problem.
The trouble is, doctors have a hard time diagnosing bipolar disorder, because they usually only see the patient in the depressive phase -- most patients feel so good in the manic phase that they don't think they need
any help then!
So if that's what's going on, you're already ahead of the game just because you're more self-aware than most people.
So yes, as others have suggested, please go to a psychiatrist
-- not your regular doctor, or even a psychologist, because it takes special training and special testing resources to assess this kind of thing. And of course, only a psychiatrist can prescribe for you once the diagnosis is made.
And despite the cliches, seeing a psychiatrist doesn't mean you're "crazy."
And it certainly doesn't mean you're going to be committed or something -- that wouldn't even be considered for someone as obviously coherent and functional as you are! All it means is that you're smart enough to look for help in the right place.
Go ahead and make an appointment! Nothing but good can come of it: if you have a serious problem, you'll get helped, and if you don't, you'll get reassured.