I love my coffee.
Though, when I have it, I get a headache. This was quite disappointing so I stopped drinking it.
Without thinking, I recently (a couple of months since stopped drinking) bought some instant coffee as I had a craving for it. Surprisingly it didn't give me a headache, and it was not until I bought a coffee when I was out did I get a headache.
So, I think it must be coffee made from coffee machines (aka Expresso Machine/Manual) that trigger them.
I am just wondering if anyone knows why this is happening or advice if this happens to you.