This story is long winded and all, but the point is, it doesn't matter how bad you have screwed up. It happens to the best of people (I'm an alright kind of guy). But the only way to fix it is to put your foot down, get dirty and fix it. It won’t always be as quick as this and will most likely take a year or more to get in a good place. Then years of maintenance. But if you need a quick hit to your score in a good way, read through your reports carefully (with a credit advisor if you need to. Many personal banks will do this with your for free if you have accounts there in good standing) If it looks like there's something off or something you can fix, call your broker, go over the report with them and STRONGLY insist on a rapid rescore. They will get all your info and see what they can do.
With poor credit, you may not be able to get approved for new credit products like credit cards. Although you may still be able to take out an auto loan or a mortgage, you’ll pay a much higher interest rate because of your low credit score. Compared to a borrower with good credit, someone with poor credit can pay $50,000 more in interest on a mortgage. Over an entire lifetime, you could end up paying over $200,000 more in unnecessary interest just because of bad credit.