Feeling like crap

I'm 4wks6d. So far I have felt ok minus the nausea. Today I woke feeling like crap tried eating and it made me feel so nausea I didn't get sick though. I feel so irritable and sooo tired. It's like everything hit at once. But I also feel so blessed at the same time and now I want to cry. Anybody else feeling this way. Also I have allergies to my dog and cat. I take medicine daily and it helps. When I get pregnant it's like it doesn't work as good. Anybody else experience this?