Anyone who has had enough anal has had “shitty experiences” – it’s your shithole for fuck’s sake. Who cares. No big deal. Be a grown up. It rarely happens and is pretty much always preventable.
Water enema or a washing around and inside the ass with soapy water and a finger – it will be fine. If it does happen, no big deal. Ignore it, never let her know, and wash your dick in the sink.