allergic to my baby

So the title is a massive exaggeration. I'm almost 16 weeks and for the last month every day I wake up with a groggy head. I sneeze constantly throughout the day and my nose pours with snot. I told my midwife today I've got a constant cold and all she said was to get an asthma review. I've always been a sneezy person, think I have hayfever. Please does anyone have any suggestions to prevent these symptoms or tablets I can take to stop these 'allergies'!
It's making me feel so run down which isn't going to help.