How to cope

My two year old loves to pull on my nipples and pull my shirt down and hit my boobs. When he does it tho I react in an aggressive way. I try REALLY hard not to and just tell him no but I was molested when I was a kid and the breasts were the only place I was molested at. It’s a sensitive subject and I’ve gotten therapy for it but when my toddler pulls or grips them I practically lose it. What can I do? I know he’s not understanding of this and while I haven’t hit him or anything, getting mad is not what I’d hope to do