Leprosy (aka Hansen's disease) is spread person-to-person, or potentially by armadillos.
https://www.cdc.gov/leprosy/transmission/index.html#:~:text=Scientists%20currently%20think%20it%20may,needed%20to%20catch%20the%20disease.
You didn't get leprosy from a cockroach - it isn't that easily spread. Even if you did - and again, you did not - it is easily treated with antibiotics.
Have you ever talked to a mental health professional about your health phobias? If not, you should really consider it. Most of your thoughts are not based in reality, and a therapist can really help.