I Wake Up Feeling Like I Have To Vomit, But

I wake up feeling like I have to vomit, but I it is only water had this happen twice this am and then later in the day I got real light headed like I was going to pass out and like i was going to vomite and my stomach was hurting. This has happened in the pass and it usually goes away. But am concern why it happens.
Thank you for a reply '