Hello Amanda: Since this is your first post, here on PC, welcome to PsychCentral.
You mentioned thinking about going to a doctor but not wanting to get on medications. Perhaps seeing a mental health therapist would be another option? You would have the opportunity to talk through, at-length & in-depth, what is bothering you. At least from my perspective, one of the most difficult aspects of struggling with the kinds of thoughts you're struggling with is not having any way to talk them through, which means that they just keep cycling through your consciousness over-&-over again. Talking your thoughts through might help to put them to rest. And, at least to my mind, you can't do this with friends or relatives. They don't know what to say and, besides, they have their own problems.
If, on the other hand, you also don't want to see a therapist either, other practices you could try might include meditation & journaling. There's also a practice that is referred to as "compassionate abiding" which might be helpful. (It's actually my own go-to practice for these kinds of intrusive thoughts.) Here's a link to a description of the practice:
Relieve Distress By Allowing It: Compassionate Abiding 101 | Mindset: Perspective Is Everything
One other thing... you mentioned feeling as though you are highly sensitive. There is such as a thing as being a highly sensitive person. Here are links to 4 articles, from PsychCentral's archives, on the subject of the highly sensitive person along with a selection of 6 additional articles I thought might be of some help to you:
What Makes a Highly Sensitive Person?
Are You a Highly Sensitive Person? | Happily Imperfect
10 Tips for Highly Sensitive People
More Coping Tips for Highly Sensitive People
https://psychcentral.com/lib/depress...dium=popular17
https://psychcentral.com/lib/the-hea...of-journaling/
https://blogs.psychcentral.com/imper...dium=popular17
https://psychcentral.com/blog/using-...o-reclaim-joy/
https://psychcentral.com/find-therapist/
https://psychcentral.com/blog/10-way...ood-therapist/
I hope you find PC to be of benefit.
