I can imagine your frustration, but I'll echo others in that you definitely made the right call.
I felt as if I had waited
so long for my surgery that I simply wasn't going to let anything stop it! For a month before, I was very careful to wash my hands frequently. I avoided touching doorknobs, railings, anything where others may have left germs. I bought a little bottle of sanitizning gel for the car. Grocery cart handles are notorious for germs. I could make my purchases, get into the car, and de-germ my hands without a sink and soap. I also upped my orange juice intake (if that is possible, I live on the stuff) and got plenty of rest. There is a product here in the states called Zicam. There is some controversy about it (some claim it permanently deletes their sense of smell) but I don't buy it. I purchase the gel version and do not use their applicator. I just squish some out onto a kleenex tissue, dip a cotton swab (q-tip) and very carefully moisten just a wee bit of the inner edge of each nostril. Then you press your nose closed for 15 seconds. It is a zinc product and I find it works beautifully. But you must investigate it and judge for yourself.
Of course, if it's allergies for you, I don't have any advice. Here in Oregon (similar latititude?) we are having the worst allergy season ever. Very unusual.....NO rain! In the continental US, I think our 3 cities are at the top (literally 1, 2, 3!) of the list most days!
Again. This feels like a setback, but you were very wise to call it off. Best of luck getting better. Please keep us posted on the new date!

Marguerite