I've been on HRT blast and cruise for almost two years now, last year I spent more time ill than I think I ever have. i cant say for sure it was 'da roidz' but I literally spent nearly two months ill, one whole month ill with flu and three separate ten day stints with stomach upsets.
I have very similar sinus problems to you and usually have a runny nose anyway, I don't regard this as being ill it is something I've had from an early age since I had infected sinus's.
The only other thing I can put being ill down to whilst 'on' was that each time I got ill last year (all four times) I had reached my max body weight, which is 230LB's, and when I tried to push past it (each time I reached it last year I managed to do it with a tiny bit less body fat whilst a bit stronger) my I would get ill and lose about 20 LB's of muscle, so really I just spent last year playing catch up, which is exactly what I'm doing now after spending all of December in bed. I think when I get back to 230 (I'm 210 now) I'll try and maintain that body weight and see what happens, I'm not too concerned about being as big as possible but being ill fucking sucks ass!