How to stop morning nausea?

no not the pregnancy type, I'm 20 years old and started having morning nausea a few years ago, not long before I was diagnosed with anorexia, I don't know if it's relevant or not, but I noticed it's usually bad if I didn't have dinner in the night before, however I don't actually puke I just get bad nausea and lately it's been getting worse that it became difficult for me to brush my teeth in the morning without feeling like I'm about to puke and I'm too phobic about puking! so please help, is there anyway I can stop the nausea?