Horomones or am I just a crank?

Hey ladies, just wondering if anyone else is feeling this way, am 27 weeks pregnant and I feel like am so moody all the time, literally anything annoys me and I just cant be bothered doing anything, I dread work everyday and I cant even be bothered doing nice things on the weekend! I have been struggling with nausea this whole pregnancy so I dont know whether thats getting me down but I just want to stop feeling this miserable! I want to enjoy my time with my 4 year old son before the baby comes but am just feeling so down! Any suggestions to get me out of this slump?