Trauma induced episode, looking for advice

In the past week, my childhood dog was put to sleep, I suddenly lost my job, and I turned 30.

I am now experiencing something that feels somatically shocking. I feel like I have been transported back instantly to three years ago when my family experienced three catastrophic events within months of each other, and I became a hermit for 7 months after. I am terrified I will lose all of the progress I have made these past years. It's been 3 days. I've decided no more alcohol or drugs for the time being and am actively trying to engage in productive behaviors.

During the past few months, I have been actively going to the gym and learning new skills so that I can make a career transition. I am utterly terrified that these 3 events and the headset, or chemical state they have ushered in will ruin me. I do not know how much "opposite action" can help me regain the mental stability that has marked the last 3 years- and of course during this time, I navigated other negatives like breakups, moving, geopolitical events without falling into an episode.

I have a therapist who is helpful, or fine. I have been unmedicated for over 2 years and have been doing well, and even when I was medicated, the meds were not specifically the bipolar classes.

I am asking for advice from anyone. Does it make sense that my mind is reacting to these events so severely? How do you deal with massive life stressors hitting at once? I really haven't felt the need to reach out in a very long time, but I'm frightened. Thank you