This is awful and I'm so sorry it happens to you.
Nothing like this happens to me, which could be because my boobs are very small but also I won't tolerate any roughness. I also make it clear in advertising and when taking enquiries that I'm only offering a gentle service. I have had a couple of men put their hands around my throat or shove fingers in my mouth pulling it back and I stop it immediately, even rough or slobbery kissing I won't tolerate. Some men don't realise they are being rough, sometimes it's eagerness after not having sexual contact for a very long time. I always stop in politely but firmly. I have come across this in personal life partners so know it's not a paying for sex thing, some men do think women like rough sex. I don't ever want to feel revulsion.