Health OCD is miserable

I am only 20 and my body, every day as of late for the past week, is convincing me something is terribly wrong. It started with heart burn one night, and then it was independence day’s heat, and now I have an ache on my left side upper back. My brain has sent me into constant panic attacks, begging people to ensure me im fine, constantly looking up symptoms and checking my heart rate or temperature whenever I feel the need. I’ve hardly slept, which I’m sure had added onto that anxiety. I vape, and this fact had convinced me that this is a lung or heart issue and I am dying, when it’s really a muscle problem since it aches when I stretch the area. I just can’t seem to get myself out of this loop, it’s getting exhausting and I’m feeling absolutely miserable. I thought I was feeling better yesterday, but I forgot a dose of my sertraline and everything started again. These anxious episodes happen every couple of months. My health insurance can’t cover psychiatry to continue help with my problems, so I’m nearly at a complete loss on what to do in the start of navigating this diagnosis.