[trigger warning] Just joined, heres my situation.

Hello, my name is Al. I just signed in to this forum in hopes of helping my ocd, just like a lot of you. When I was about 8, I was obsessed with looking at the right side of things. If I did see the left side, I would have to look at the right side (compulsion) after in order to find peace. As time went on, my ocd went through different obsessions. Now at 17, I recently changed medication to Celexa and had pretty much most of the negative effects. (Nausea, vomiting, decreased appetite, etc.) Another loved one also got sick and threw up a lot with Ever since all that my OCD changed. Now I obsess over something else: death/mortality. I fear for my own or someone I love. I have started reading an OCD therapy book (also meditation) with a loved one who also has ocd. So far I have seen improvement such as hours without the obsession which I didn't even expect at the time. My brain seems to keep reminding me that we are all mortal and it skips ahead to the death of myself or a loved one. Sometimes this is vivid and sometimes not. The thought of it is torture and keeps me from being in the present which is my goal using meditation and mindfulness as well as techniques such as ERP. That's my story but I will write down some extra info and questions I have as I think of them so I might be editing this post a bit.

Thank you so much for reading and be free to post anything in reply
Pre Question Info: I had my ocd relapse while adjusting to Celexa. At the same time a loved one was sick and throwing up with diahrea (they have gastro intestinal issues but we thought it might of been the stomach flu). I had to endure the hell that was the negative side effects on me as well as listening to that loved one throwing up in the bathroom next to my room. It happened at night a lot so it did disrupt my sleep. Question: Is it possible that those two things combined was enough trauma to create this ocd obsession about mortality?
Thank you so much for reading and be free to post anything in reply

Also keep in mind that my OCD catastrophizes things so I was extremely worried.
Note: I went to the doctors a few days ago for intestinal problem and he thinks its an ulcer caused by stress. It fits the time frame with around when the OCD got worse.