I'm sorry FF, I didn't see your other post.
Are you just seeing a GP or a colorectal surgeon? I think a GP can only prescribe things like GTN. If you want something stronger like diltiazem you have to get it prescribed via a consultant at a hospital.
I would stay off all strong lotions and creams that may be irritating you for a day or two and just shower and dry with a hair dryer on a low setting.
It's so disappointing to have a set back when things seem to be going so well, but I'm sure you can get things back to a manageable state soon
OMB x