Feeling dirty a lot

At the start of the year I had food poisoning and since then, I have kind of felt more uncomfortable with touching things, like doors, traffic light buttons, things that a lot of people touch so they feel dirty. I feel like I have to wash my hands a lot. I went to a restaurant with my family and felt so uncomfortable sitting on the seat because there was visible dirt down the side, I didn’t want to take my coat off because then my coat would be touching the seat. I didn’t want to touch the table either. When I go on a train I feel uncomfortable because so many people touch the seats and they probably don’t get cleaned very much. It’s so difficult seeing everything just covered in bacteria. I don’t know if my discomfort is reasonable or not. I don’t know if this is related to me having autism or if it’s unrelated so just wondering if any other autistic people have experienced this kind of feeling?