What's wrong with me?

Hello, a week ago I had a really strange dream. It was about the death of two acquaintances of mine from school. I recognized one of the people in the dream; they died in an accident. What was strange, however, was that they had a different name than in reality. I can't identify the other person, but they were in my class. Ever since this dream, I've been worried that something is wrong. Before this dream, my partner and I had sex. I'm on the pill, and he ejaculated outside, but this time something must have gone in. The next day, because I was having Mittelschmerz, I did an ovulation test and it was positive (I know it's pointless when I'm on the pill), but I still had a brief period. At the weekend, we went to my mum's and I started thinking, what if I'm pregnant? Then I thought about my high blood pressure, what if there's something wrong? Then I couldn't sleep anymore. On the Monday after this weekend, I had a C/P x-ray because I recently had corona. They diagnosed not only scoliosis but also tiny densities in my right wing. Naturally, I turned to Google… That didn't help me. Now I interpret every little "symptom" as serious illnesses. I have to note that I've had this in phases since I was little. I've also experienced the death of acquaintances. Unfortunately, they died from illnesses that I've been worrying about for years. I feel really strange; I can't enjoy anything at the moment because I think I have something really bad, and I also think to myself that I can't enjoy it now. I have something like obsessive thoughts. I have a pretty persistent cough at the moment, and I feel like I'm listening to my inner voice much more, and then I think to myself, "Why do I make so many promises, etc." Because of the scoliosis and high blood pressure, I always have a stiff neck, mostly tension headaches and fatigue headaches. But I'm still thinking about it. Today I feel like I'm standing next to myself, perceiving everything as if it weren't real (I had something like that once when I was 14, just before my period), and I feel like I'm going to have a panic attack at any moment. I can't think or do anything for a second without being afraid.

A brief history of my medical history: I have depression, social phobia, hypertension, hypothyroidism, scoliosis, a specific phobia, and I take the mini-pill.

I assume that these feelings and "symptoms" have developed due to the immense stress situation and that I probably suffer from hypochondria and depersonalization or derealization.

It usually goes away after a while, but after all these years I want to know what I can do about it.