Caffeine withdrawal is no fun

I was diagnosed with a hiatus hernia a few months back which had been causing me constant indigestion. Since then I've been taking some medication to help but little had changed, I still had indigestion. On returning to my GP I was told I would need to give up caffeine. Don't get me wrong, I'm not a coffee addict but I do like tea and have about 6 mugs of it a day. No worries, I thought, I'll buy decaf. That was two days ago and today I have had a headache all day despite taking analgesics to get rid of it. Not only that but I feel listless but restless as well. Foggy in the head (I know there are some that would think that was normal) and blurry eyed. I can't concentrate on anything much and I'm either cold or flushed.
I assumed it was due to the medication I was on being increased but then, as I was about to make myself an after dinner coffee I suddenly realised it was the lack of caffeine that was the most likely culprit.
I Googled caffeine withdrawal and to my dismay discovered these symptoms can last a week of more. I don't know why my GP didn't warn me of this. I'm now thinking that going cold turkey on caffeine is not the right way to go about this and think I will allow myself one cup of proper tea tomorrow even if it does result in the return of my indigestion which, btw, has improved.