Re: Is something suppressing my immune system?
Read the "Weak Immune System" thread here in "Health and Medical Issues". Some of us have had similar problems. IMHO it's stress. I was sick 6 times (three of them with food poisoning like symptoms) between September and December last year and in January I was forced to make the decision to either quit CrossFitting or stop my weekly allergy injections. I chose to stop the injections and I've only been sick once (so far) this year <knock on wood>.
That said, before starting again earlier this week I haven't CrossFitted since January because I opted to follow a 12 week Starting Strength program instead; so I may be in for a rude awakening in the next few weeks.