Keep the surgical appt., provided your cold isn't in your chest you should be fine.
I had well meaning family members try to talk me out of surgery. I had the surgery anyway; they had no idea how sick I was (because we always look good on the outside) and for how long I had suffered. After they saw me in the hospital they realized they were wrong and should have supported my decision. It was immediately apparent after surgery that I had regained my health and it became very obvious that surgery was the right decision.
If you don't want to have surgery or aren't ready for it, you can cancel it.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free