If you want the short answer: don't know, and it's impossible to quantify with the existing data sets.
As I've explained in my longer responses above, there are too many factors that could have been interfering with your formal test performance at the time of your second set of results to determine how much of that was regression to the mean from your very early (and consequently also lower reliability) testing, and how much was the interfering factors. Whatever your "true" numbers might look like, you're clearly intelligent enough to do whatever you have opportunity to do and commit to.
Your IRL performance data are more important anyway. Do what you can do to get yourself to an emotionally and physically healthy place, and then pursue whatever field of study floats your boat, keeping an open mind about natural changes in your interests that may occur along the way.
All the best.
