oh, please don;t fret....tis a throw-away comment that you have taken to heart because you are feeling sensitive. It isn;t meant in the way you have taken it, I promise.
I know, I have been there. I had DD3 ever so poorly for a long time, and I had the HV comment that at 5wks old, my DD3 had been more than some other babies at a year old, and then by the time her 3rd birthday check came, she had had over 34 admittances to hospital.
tis just the manner of the game with some children, sadly. Some get poorly lots, some don;t. But the ones that don;t, and their mummies, have other issues that they get guilty over.
I doubt either that you are getting much sleep, and together with the fretting about your DD, you are taking it all too much.
my sympathy.
one thing......if that comment comes up again, open up a convo about whether they think it worthy of a referral to a paed, just to ensure that there is no underlying cause for the constant infections. There probably isn;t, but if you are anything like me, you are probably also convinced something dire is going on (completely normal to think that BTW), and a referral might well put your mind (and heart) at rest.