Though getting sick is a big deal when you're an athlete. So I also tend to take Immunochoice as a preventative measure (and also Solaltech IMMUNITY). When sick, Linctagon+ACC200+VitC1000mg works for me.. with regular cooking sessions in the sauna at the gym (induces a fever effectively, ill-advised if you aren't used to it). I'm a little paranoid, but when you lose 2-3 weeks of training, you lose 2 months of progress. I haven't been sick for 2 months and I'm finally getting quicker now!
Good luck though and take it slow when you're coming back. Also, do not do anything if symptoms are below the neck (like Bronchitis). Once that clears, then only consider getting back into it.