I've been using Diltiazem-Lidocane for a few weeks now and have the strangest feeling in my butt right now. It feels a lot looser, almost as if something is going to fall out, but I've had no issues with incontinence and my fissure is definitely still there as I have a bunch of pain from it. If anything, it's been hurting a lot more with using the cream, but my blood has gone away.

What is going on? I started my period today so I wonder if that has anything to do with it somehow?
I was planning to schedule surgery with my CRS as the cream is to be discarded after the 10th of July.

Did anyone have a similar experience? I'm worried I'm not as tight down there as my CRS says and the surgery will make me a lot worse

Since you're worried about this I would ask for an MRI as well as anorectal manometry. The MRI will detect any anatomic abnormalities and manometry will confirm if your sphincter pressure is normal or high.