So! I'm a little sore today but I think it all went well. Have more antibiotics and it’s just a bit of a waiting game now to see if it's successful (the procedure has about a 60% success rate, but that's still better than 50% right!) and I’ll go back in around 8 weeks.
Also had my second sinus post op appointment this morning and she was really pleased with how that's gone, so that's fab. She also suggested that if I have many more things go wrong one after the other again I should think about seeing an immunologist which was interesting. I guess she just thinks it gets to a point where it's not just bad luck and there may be something not quite right. But hopefully that won't be the case!