I've always been of the opinion that you don't call in sick for a cold.
Struggled in yesterday, felt bloody awful. Boss told me I looked bloody awful. (Tbf I had an important meeting which is why I stayed).
Today I don't feel any better - hot/cold, feeling sick, skin hurts, very congested, can't lie down or I feel like I can't breathe. (Hence being up now).
Aibu to call in sick for a cold? I feel like if I get on my commuter train, I will either be sick or pass out, but the concept of calling in sick for a cold is a bit 
If it helps, I don't work in a health care role or catering or anything like that.