I am now full of cold, 2nd one in 6 weeks, normal?

I rarely get them but when I do I get sinusitis usually. GP today said it may well be just a cold but he wants me to take antibiotics as I have had bleeding from my right nostril and pain for 3 weeks now so there maybe infection there so another bout of sinusitis.

I feel all heavy headed and full of it. Why me? why do I have another cold? I have only just got over the last one after getting really bad sinusitis aswell last month. My children have had the snuffles recently but I assumed it was what I had already had but here I am snotty again