Suggest Cure For Severe Headaches

Hello Dr,My name is Betty,I've having severe headaches for about a week accompanied with a upper back pain (lung level pain) and I was taking excedrin for about five days now- once a day- but yesterday night I vomit my lunch food and today I have felt nauseous the whole day and I 've being vomiting 4 times so far it just bubbling liquid; kind of flema and the last time was a green bittered liquid. On the other hand my Dr. gave me the results of a pelvic CTScan and he said that "I have a fatty liver" and the results from the blood test show that I have iron deficiency so I am Anemic. The headaches are very intensive and had put me down but the pain reliever is giving the vomit. How can I get a relief? (My Dr. told me that I should be on rest until he find out what is the problem; so I am off from work for three days now) What should I eat because I feel nauseous most of the day? Is there any explanation for this.