The headache that wouldn't die

At my last meds appointment the nurse added a new medication to what I am currently taking. It's now been about 3 weeks but instead of feeling better Ive been having almost daily headaches that don't go away even with aspirin use. Headaches are a side effect of the second medication. So I'm now trying an experiment, I stopped the second medication yesterday. I'm still dealing with headaches but it could be withdrawal. After erands this morning it thought today's headache may have been caused by dehydration but I'm now on my third 30oz. bottle of water and my headache is getting worse so I don't think that was it :-/ I'm going to restart my half training tomorrow after I drop off my mom. I'm crossing my fingers that the headaches end soon