Research shows that individuals with borderline personality disorder (BPD) can experience brief states of depersonalization, hallucinations, paranoia and suspicion. They can also experience psychosis-like symptoms such as feeling as though they are losing their grip on reality. The symptoms you described may be part of BPD. I cannot say for certain whether your symptoms are associated with BPD or if they are a sign of another disorder such as schizophrenia but generally speaking, your symptoms are fairly consistent with BPD.
I would recommend having a psychiatric evaluation. An evaluation would be helpful in determining whether your symptoms constitute the development of schizophrenia. As I remarked above, your symptoms seem consistent with BPD but it is important to rule out a possible developing psychosis or schizophrenia diagnosis.
You did not mention whether you are in treatment. If not, you should be. It would be difficult to experience the many frightening symptoms you have described. I get the impression that you may feel like you are living in a fog, not sure of what is real and what is not. This is not a healthy way to live.
Psychotherapy may help to address symptoms such as mood instability, racing thoughts, confusion and memory loss. Medications might be helpful as well. Medicine may be particularly helpful for hallucinations and paranoia. Some physicians prescribe a low-dose antipsychotic to treat hallucinations and paranoia in individuals with BPD. Antidepressants, particularly selective serotonin reuptake inhibitors (SSRIs), have been found to be helpful for mood instability. These are all treatments you could explore with a therapist and a physician, preferably a psychiatrist because of their additional training in mental health.
Here’s a link to Psychology Today where you can search for a therapist in your community. Many individuals with BPD prefer to consult a therapist who is specially trained to work with this population. If possible, I would recommend you do the same. Thank you for your question.