Will the IRS come after me if I have an international bank account?

I would need you to answer 2 very simple questions, but before than that I need to give you a (long) explanation of the facts, I am trying to be as clear as possible: I have been working on a visa in the US in the years 2006-2007 and 2008, then left the country and came back in 2010 as green card holder, starting to work again in the US. In 2011 I lost my job and received unemployment for about 3 months. Finally, in January 2012 I got again a stable job that I have still now. Summarizing I had to do tax declaration for years 2006-2007-2008(as a F-1/OPT then J-1 visas holder) and for years 2010 and 2012 as green card holder (did not have to do 2011 as my total income for that year was of about 4300 $). Now it comes the complicated situation: I just did my 2012 taxes with H&R as usual (guess is going to be the last time as I find them utterly unprofessional and not knowledgeable). The guy told me to fill a form 8938 as I hold a non US bank account with about 216000$ in my home country (combination of the savings from my work before coming to the US and a gift from my family). I filled it and I also put an estimate of the interest I made on this account in 2012 that is about 3100 $ (a mix of interest and capital gain coming from me playing a bit with the currency USD/EUR exchange). He also told me to fill a TD 90 F form by June 30(I will do). After all these things I made a personal research on these forms and I learnt that I should have declared this bank account in my homeland also in the past years (thing I did not do). The H&R guy told me that is ok like that: IRS will appreciate my honesty in declaring it this year, but I don't buy it. I am fearing that IRS will come after me, triggered from the fact that I have a consistent amount of money abroad and they may ask me why I did not declare it before (i was not aware that was a requirement), I read that there are crazy penalties and I am scared to death. To make it more complicated.