1)you wrote "putting ...chemicals in your food and medication,"

what does this mean to you "chemicals"? what do these chemicals do?
what do you think the medication is?

2)and then you write "give me chemicals to be someone else"

what do you think your medication does to your mind?
Who are you but your mind?

and yes I have had and do have those thoughts and feelings, so you are not alone.
I use logic to handle the fear/worry by asking myself
what are the odds of this being true?
why do I think this way? should I continue to think about it?