Major headaches from neck & shoulder pain - Help!

I have had a history of migraines that subsided within the last few years. However, lately, I get very painful headaches that are similar to migraines where I get very nauseous, am sensitive to light and smells - and have about 3 bowel movements! The headaches stem from my neck/shoulders, which are always very tight and have about 100 knots in them. Almost every time my neck/shoulder pain is severe, I then start feeling nauseous and the headache sets in. Pressure around my head helps, as I usually wrap it in a bandana and rub liniment oil on my neck, shoulders and head. I have done the lemonade cleanse twice this year and feel good afterwards, but the pain in my neck and shoulders always creeps back and rears its ugly head into monstrous headaches. Does anyone have any insight on this?? I am under 30 and tired of dealing with this!! Thanks