If you are looking to become a surgeon, you are looking at years of intense, high-pressure study and training.
I would like to see you get your feet firmly under you, as you said you are recently beginning to get professional help. You have survived hard years. Get securely on your feet before making any major commitments.
The advice about community college is good. Test the waters. See how you feel about classwork and studying and supporting yourself.
Prepare for the SAT even if it is just checking out past tests from library. Take the exam. Take it again if you want.
It is good to have a high goal like surgeon, but it is considered one of the most highly specialized fields in medicine-- lengthy training, intense competition. Have a back up plan that would work for you, just in case, like RN or physician assistant, which also have specialties.
The worst is over. Many people reading your question can relate to your story. Your first job is to look out for your own well-being, then to plan and work for a future that will be fulfilling. Good wishes