Wow, poor you!
Honestly, I think you might want an enema to deal with the current crisis, and I never say that, because I hate those things! But this could be an emergency, and if you don't want to go to the ER, you've got to do something.
Beyond that, I think you should definitely get some Miralax and take it every day while you wait for your appointment. It helped me to completely stop tearing while I waited to have my surgery. It also stopped the pain after BM's for me.
I hope you can find a good surgeon soon, this situation sucks way worse than just having the surgery. I had my fissures a long time too--5 years off and on. Not. Worth. It.