Touch vs Ingestion: I'm pretty sure you have to touch something to ingest it, so that shouldn't be a big problem. I would generally recommend vampires to not swallow crucifixes.
Chronic Pain also applies an Affliction to you, although rather more randomly. It's a better basis for when you need to apply random Coughing And Sneezing for e.g. seasonal allergies or
Victorian Novel Disease.
Like Revulsion, you can scale it the same way.