Deleting your thread is a disservice to other people looking for advice.
You did indeed get yourself into a mess. Getting a lawyer to help you clean it up is the best way to get rid of the stress. It will cost you some money, but your mental health, your baby-to-be's health, and knowing that your son's parental status will be CLEARLY defined and legally sound at the end of the process will be well worth it. The lawyer can do the leg-work of finding and serving your exes and knowing what paperwork to file and doing the talking for you at any hearings. To me, that's worth whatever you have to pay for it. It will make the mountain of complications you have now seem small and manageable.