Will, I'm sorry to hear this.
I hope that you return back to the saddle before the start of the trip. You have over 4 weeks to recover. You can do it. Ibuprofen and Epsom salt bath can help reduce the pain and inflammation.
Use 2 cups of Epsom salt for a standard-size bathtub. Pour the Epsom salt into warm running water. Soak in an Epsom salt bath for 15–30 minutes or up to 1 hour.
Try it and see if that works for you.