Morning headaches. As well. please help.

Hi, I have been getting morning headache ( mostly on any one side of the head ). What I have observed especially when I eat heavy dinner and sleep ( gap of 2 hours before sleep) maybe because of that . Or maybe sometimes I clench my teeth while I am sleeping too. I am also confused if this is due to deficiency of iron ( since I have dark circles under my eyes). I don't sleep peacefully and wake up middle of the sleep ( mostly between 2 to 4 ). Then take around an hour or 2 to go to sleep. This routine disrupts my entire day and sometimes I have to call sick and I hate these headaches. ( I do suffer from migraine for various reasons for around 15 years, have done my brain scan _ everything was normal). To carry my normal life I sometimes consume 4 to 5 painkillers which does not affect me anymore I think. Extreme headaches leads to vomiting and nausea. I even started home remedies such as hot water lemon juice in water. Thinking I have acidity issue as well. Please help.