Yes , it is irrational.
They will have most likely forgotten all about it by now.
Has it occurred to you that if they did come to your door (very unlikely), it might be to say that they were sorry that you were ill and hoped that they had not upset you ?
You are really going to have to get a hold of yourself, gordie.
Sorting out your sugar levels by following the advice of your Dr and specialist nurse would be a start.
Learning to tolerate some discomfort like a bit of nausea would also help.
Most 'symptoms' are not indicative of anything much and will fade over an hour or so.
If you know that a side effect of your medication is nausea, you just have to put up with it for a few days at least ...if it is persistent and very unpleasant, then ask your GP about changing your medication...but please, give it a good try first.
And please continue to attend your counsellor as your anxiety is a major problem.