Can allergies make you feel like you have a bad cold?

Hi All!
Guess what, two days no eye twitch! – Yay, but now I think I’ve got another cold on top of the flu, and for me that’s pretty much ruining me.
I’m wondering however if maybe it’s allergies?
I’ve got a blocked, congested nose, sore eyes, sneezing lots, my eyes feel red and itchy but they don’t look red. I’m tired and have a croaky voice and a scratchy red throat. I feel pretty miserable, to be honest, but I thought allergies just gave you symptoms without actually making you feel sick. Can allergies actually make you feel miserable and how would you know the difference?!