All I am looking for is advice as to whether if I am breaking the law if I possess a legally purchased firearm.
I am not a lawyer, so please check out what I say before you believe it. I believe the Federal Law that set up the NICS pertains only to the purchase of firearms, not to any firearms you may have possessed at the time of the fiasco and the legal aftermath, and you still have now. There is another Federal law, passed in 1968 (the exact name escapes me right now) saying people who have been judged by a court to be insane and a danger to themselves or other are prohibited from owning firearms. I think this is the law that concerns you.
If indeed you were "committed" (and committed has a very specific legal definition) than you are indeed a "prohibited person" and will have to get a lawyer and petition the state to have your rights restored. Sorry.
I agree the key word here in “committed.” If your local police sent you to a mental care facility for an observation period, I don’t think that counts as committed, even if they got a judge to sign a court order making you stay there. I think in order to be “committed” in the can’t-own-firearms sense you would have had to have had an hearing before a judge or even a jury trial, where you had legal representation and a chance to cross examine witnesses against you.
Did you have a lawyer at any time in connection to the incident? That lawyer would be the first place to ask, and if you didn’t have a lawyer, or other legal representation I am guessing you are free to own firearms. You could also ask the institute where you stayed afterwards, about what your legal status was when you left. Once you know the legal name for the status, you could ask your Officer Friendly on your local police force.
All of the above is about Fed law; I believe you also have to check Iowa law too.
As an aside, we have all seen old people who lose their ability to drive a car safely but don’t realize it. I hope if/when I get to that point I realize it, about cars and firearms.