A bit of help, please.

[Seras for Two]

I suspect that this sort of question may come up often, but please bear with me for a bit since I am very confused and don't know where else to go.

Okay, the basic question is: how can I find out whether or not I'm intersexed if my external genitalia seem to be in order?

Now for an explanation: From about the time I hit puberty, or maybe even earlier, my gender identity has become quite blurred.

While I am a male myself, quite frequently (and I suspect that this has to do something with the fluctuation of hormones, but honestly I have no clue) I begin to strongly, but temporarily, identify myself as female.
It's hard to explain, but it's sort of like I'm going through my day like normal and then something in my brain just clicks (probably the estrogen) and my emotions get all jumbled up and I start behaving and feeling like a woman, as if it was the most natural thing for me to do.

And then sometime later it fades and I look back at it and think "What the hell was that?"

This may sound close to being an MtF transsexual, but I honestly have no desire to have a sex change or become a woman permanently.

And with that, I have two questions:
1) Is it possible that this is a result of an intersex condition? Because from what I observe in myself I suspect that I either produce too little testosterone (hence the lapse of identification as a male) or too much estrogen (hence the occasional identification with the female gender).
2) What should I do about it? So far this condition has brought me nothing but mental turmoil, since I can't in any way control or restrain it, and it is quite distressing to have my gender constantly flip backwards and forwards in this judgmental world.

Any advice? Would really appreciate anything you throw at me, except for rocks and chandeliers.