Whats wrong with me?

I've suffered from severe depression in the past due to a medication i was on and social "things". It runs in my family and im really not sure if that was the only time i was depressed.
When i was 10-11 I would sit in my room cry and put a knife to my wrist wondering if i should do it.
This was before the medication, i didnt really think there was anything unusal about suicidal thoughts when i was younger and my family didnt quite notice that i was depressed.
Now, off of the medication and problem free, i still feel depressed.. if thats even whats wrong with me.
im really not sure if its anxiety or bipolar or what!
i get servere mood swings where i can be extremely happy, than feel like crying shortly after.
when i argue with someone about the smallest thing, i end up screaming and yelling and afterwards having no idea why, i have constant thoughts about suicide, i have extreme anger, i cry at the drop of a hat and i go from one emotion to another in the matter of minuites,
so my question is, Whats wrong with me?

[ILADVOCATE]

Its really hard to say. Medications have side effects but I've never heard of one inducing permanent depression. That's highly unlikely. Since it runs in your family it might make more sense that you have it as well. Only a psychiatrist could provide a specific diagnosis as to whether its depression or bipolar or anything else but you could keep a mood tracker here and print out the results for them and they could understand it better.

[mammo]

You sound very depressed, which can cause the mood swings.  You may think your life is problem free, but it sounds like you still need medication.  If you have a chemical imbalance then you need to stay on medication the rest of your life.  Most of us start feeling the way you are and think it's odd, because our life is so good, but there are things that we think we've dealt with from the past, when in reality, we've just neatly tucked them away.  They will always come back and with a vengeance.  Medication would not have caused your depression or social issues, if anything it helped it.  You really need help, see someone and get your life back.  There are so many of us going thru this, so you are not alone.