Ugh someone help

17 weeks pregnant and feeling like crap. As soon as I wake up in the morning I feel sick, it's not very often I'm not sick either, before I've even eaten which makes me feel awful. Leaves me with no energy, and just generally feeling rubbish. I have a 3 year old and I feel so bad not playing with her because I feel sick all day :( wondering how I'll cope the next 5 months, I feel like this feeling and sickness will never go.. I cry most mornings because I'm just fed up. I want to enjoy being pregnant :( :( :(