I'm sick....but feeling guilty about not training

My trainer gave me the OK train while sick but at a low intensity and lower volume that the plan called for. Basically, whatever I felt I could handle. This kept me from feeling too guilty. You won't 'lose everything you've gained' and it's not like going full force is going to help you heal.

This is only one bump in the long road to Moo so hang in there!

It's always a hard one to judge.  You know your own body better than anyone else.  As a general rule of thumb: if I feel crap, i.e.: I have a sore head (fever ish), a saw throat etc... then I won't train, but if it feels a bit more like a niggly sore throat or cough etc... then I'll train.

Most people say if its in your head (ie headache or sinus) you can train but to stop once it goes to your chest.  I sometimes feel the same 'guilt' when I do not train. I feel like I should be doing something.

Thanks for all the comments. It does help.
This is a real #$!@ of a cold. It has progressed from my throat to now my sinus and ears. Ears are completely blocked, nose running like a faucet, plus I am sooooo tired. Swimming and running are out, so I have my bike on the trainer and yesterday did just an easy spin (kleenex kept handy) and today I went for an hour walk with my dog.
I realize I need to listen to my body and get healthy before I can return back to normal training. The hard part for me, based on past experience, is that as soon as I begin to feel a little better, I over do it.

I guess I'm just overly concerned since this is my first time training for an IM. I worry about every little thing and it begins to erode my confidence. Plus, I was feeling great before this happened.
But, I do have time, so my mantra will be... must be patient... must be patient.