Is there medicine for negative thoughts

I have really bad anxiety and I think the worse case scenario in everything. I can’t do it anymore, I don’t know how to stop it. I would think someone’s in my house when they’re clearly not, I worry if my husband will get in a car accident on his way to work. I worry about every single thing and I try to block out the negative thoughts but I can’t. Im not depressed or anything like that, I just have severe anxiety and I want it to stop :( every time I get sick I basically think im dying. It’s gotten so bad. I can write a novel of the crazy thoughts that run through my head. I also hate medicine and feel like every medicine makes me more sick, I will research a medicine for hours. Has anything helped you? :(