Health vs Grade?

I’ve had a cold for about 1 1/2 weeks now, accompanied by dizziness even sitting down. My delimma is, my body is telling me to rest, but my 16 college credits demand otherwise. For example, I explained to my weight training instructor that I’ve been sick/dizzy and could I take home my log sheet and complete my exercises at my gym if I’m feeling better in the next couple of days? She said no. I slugged my way through the workout and felt weaker for the next couple days. In instances like these do I:
A.) Let my grade suffer and listen to my body– get lots of rest, etc.
B.) Do the workout and stop being a wuss. [Is it true you can "sweat out" a cold?]
C.) Is there a happy medium in there somewhere?
* Oh and what are some things I can avoid/consume in my diet to help boost my immune system and get better faster?

What you need to do is visit a doctor. That is your “happy medium”. If you visit a doctor, they can diagnose you properly, give you the proper medicines/recommendations. Should you need rest, they can supply you with a doctors note that you then need to copy and give to the dean, and all of your instructers. There is no better solution then that. If there is something like bacterial growth or a virus, it will not just “get better with rest”.. some things you could rest for 2 months straight and they wont go away without medicine.

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