Almost 8 weeks and it’s exhausting

I have never been so incredibly exhausted and tired even after getting sleep. My first pregnancy I was tired but definitely not this tired or exhausted. Any tips on beating the yawns and head bobs I am falling asleep at my desk at work and cannot focus to the only thing that wakes me up is my large chick fil a dr.pepper which after an addiction last pregnancy I am trying to avoid soda at all costs, help!! And to top it off I have a head cold from allergies and can only take Tylenol, which isn’t helping! Someone help!!