Could this be BPD, OCD, anxiety, or something else?

I’ve been struggling with my mental health for a while, and I’m starting to question whether my previous diagnosis of depression with anxiety explains everything.
One of my biggest problems is very intense emotions and fear of abandonment, especially in my relationship. When my boyfriend goes out with friends, wants time alone, or doesn’t reply for a while, I can feel extremely rejected, even though rationally I know he hasn’t done anything wrong. I can go from feeling okay to crying, panicking, becoming extremely jealous, or feeling like nobody loves or likes me.
I also struggle with impulsivity and emotional outbursts. When I’m overwhelmed, I sometimes say or do things I regret later. During particularly intense crises, I can have very dark thoughts and say things about not wanting to be here anymore. I’ve also had periods where my mental health became severe enough to require psychiatric hospitalization. These situations usually happen when my emotions become completely overwhelming rather than because I constantly feel this way.
I sometimes feel like my boyfriend has become my main source of emotional stability, and I know this isn’t healthy. I’m trying to build my own life and learn how to cope with being alone, because even relatively normal things like my boyfriend spending time with friends can trigger a very strong emotional reaction in me.
My psychologist recently told me she believes I have OCD. I have distressing intrusive thoughts and compulsions, such as repeatedly checking doors or the gas. I also struggle a lot with anxiety and overthinking.
I recently saw a psychiatrist who suspects an anxiety disorder but doesn’t want to give me a definite diagnosis yet. He wants to focus on treating my symptoms and observe me over time. ADHD has also been mentioned as something worth assessing.
I’ve started wondering about BPD because of my fear of abandonment, intense emotions, impulsivity, severe emotional crises, and difficulties in relationships. At the same time, I’m not sure whether BPD actually fits me or whether some of this could be explained by OCD, anxiety, trauma, ADHD, or something else.
I’m not asking anyone to diagnose me from a Reddit post. I’d just really like to hear from people with BPD, OCD, ADHD, CPTSD, or severe anxiety.
Did anyone have similar experiences, especially with intense reactions to rejection/abandonment, emotional crises, or unstable emotions? Did you initially get diagnosed with depression/anxiety before finding out something else was going on?