I don't know if it's worth it since you're having surgery this week but you might be able to call the new therapist's office and explain that you no longer have a therapist to see if they might be able to get you in sooner given the circumstances.

EVeryone is different but I really needed 2 weeks before I had therapist after my hysterectomy. I had a phone session at 1 week post-op and I was still so tired and on pain meds that my therapist couldn't keep me awake and eventually very gently told me that I was asleep and he was hanging up. So it was kind of a check-in but not the best. Other people have an easier recovery than I did though so maybe it would be ok at 1 weeks for some people.