Posting here for traffic.
I was quite unwell in summer 2013, off work for months.
I've been back since November 2013. I would say I got back to 100% in about july 2014 and since then I have been getting more and more colds. I didn't get anything while I was ill so maybe I have a lot of immunity catching up to do.
I started getting a cold every few weeks even in the summer. It would, to be honest, (and to my dismay) take those few weeks to get over them. Then I'd get another.
Now it's taking me only two or so days of feeling grotty and exhausted but since the start of the year I have had three! I'm at my wit's end. I haven't had any time off yet but am feeling like a zombie most of the time and I literally have one day of feeling no longer knackered and ill and sweaty etc before I get another.
I am really worried if it carries on like this I will have massive amounts of time off, either for the colds or what they cause and I am in a new job (as of 5th Jan). Was ill on sofa all weekend, felt ok by yesterday and today me (and my DP) have woken up with telltale sore throats and (just me) exhaustion again.
Did you ever find anything that really worked to prevent colds?