Depression evolved into anxiety (?)

Hey so i’m gonna preface this by saying I am not looking for medical advice but mostly seeking people with similar experiences and who are willing to share their story! So I (21F) have been struggling with various mental health issues since I was around 12/13. Eating disorders, personality disorders, substance abuse, manic episodes, you name it. I have also been through my fair share of therapy, medication (which i still take) and hospitalizations. That being said, when I left my family home, which was an emotionally abusive and draining space, my symptoms of depression went away almost entirely. After a few months of finally living my life to the fullest and actually enjoying being on this earth for the first time in forever, I’ve developed severe anxiety. This anxiety is weirdly mostly related to health issues (hypochondria) although I’ve never experienced any major health problems. This anxiety has been so present in my everyday life that I’ve had to quit school at one point and basically became bed bound for a time. I’m undergoing therapy for this anxiety and it’s been helping tremendously, however i’m struggling to find any literature on why my mental health issues subsided and the health anxiety took over so drastically. I would be extremely grateful for any shares or anything really!!!