Suggest Remedy For Persisting Headache

Hello, I snorted crystal meth for 1st time doing it and did too much. I started freaking out and went to ER. They did tests on me and said my head would be all right. However this was three weeks ago and I'm getting bad headaches off and on that I've never had before. I will never do meth again. I'm wondering if these headaches will ever go away though. Sometimes it is very painful. Thank you