Am I bipolar or just naturally moody and stressed?

I have had some sneaking suspicions that I might be bipolar for a while now... but who knows? Maybe I am just moody! Basically, i have one normal personality most of the time, but every couple of weeks (sometimes more often than that) I feel like a totally different person for days or hours at a time. I have some seriously depressed mood swings, where I cry all the time, try and lock myself in dark rooms and just want to sleep, and be completely alone. And then I have a very weird mood where I am extremely hyper, but very irritable. I have frequent panic attacks in either mood. I am a new, young mother and obviously my life is crazy, so I am not really worried about the sad moods as I can usually handle them with help or just wait them out, but it is the other mood that really freaks me out! For example, one night I stayed up until 4 in the morning organizing and arranging (and re-arranging, and re-arranging, and re-arranging) the pantry. I didn't want to be talked to or touched, and my skin felt, I don't know, tingly? Like my whole body was on edge. I am thinking I should see a doctor, I am just wondering if this is manageable or what it is. It was much worse when I was pregnant or when my life was generally bad, and I would completely LOSE my ish. My life is happy and (mostly) perfect so the episodes are way easier to handle, but still a major inconvenience. Help?!