[Storyteller.]

I definitely agree that you should try to drink more water as that's a solid preventative measure (and also helps reduce your sugar intake, which could be part of the problem). It sounds like your body is accustomed to having a certain amount of caffeine every day, so my suggestions would be either to reduce the amount of coffee you're drinking and/or to not drink it on a regular schedule.

For example if you always start your day off with a cup of coffee, your body gets used to it and may not cope well without it. So you could have random days where you don't drink any coffee, and days where you don't have any until later in the day, and etc. You could also try slowly reducing the amount of coffee you're drinking - and take into account other sources of caffeine as well so you can monitor your overall intake. Depending on how your body works, it could also be worth considering a short "detox" - for example not drinking coffee for a day or two. I find that works for me; if I have a certain amount of caffeine for a few days in a row and then skip a day, I usually spend that day feeling pretty ordinary (irritable, headachey, etc) but then the next day I'm fine. In some cases that might be all you need, just long enough for your body to flush its system, but if you don't think you can put up with the withdrawal symptoms then I'd recommend just trying to cut down rather than go without.

I hope this helped a bit, and good luck with it all.