Thyroidectomy and caffeine

Hello. Ten days ago I said goodbye to my thyroid. I know that there are people here who have had the same surgery but cannot find anything relevant to my query in the old posts.
I am feeling well but I don't seem to be able to process caffeine anymore. That is: I drink a cup of weak coffee and after about 30 minutes or less my head spins. Then I have to lay down and it takes at least one hour for the worst to pass followed by feeling slightly dizzy for the rest of the day. Blood pressure now back to normal although last week was high.
I wonder if this has happened to other people as well. My Euthyrox has been upped to 125 from 100, so maybe it is that?
And are there other things lying in waiting for someone without a thyroid?
I am feeling well but I don't seem to be able to process caffeine anymore. That is: I drink a cup of weak coffee and after about 30 minutes or less my head spins. Then I have to lay down and it takes at least one hour for the worst to pass followed by feeling slightly dizzy for the rest of the day. Blood pressure now back to normal although last week was high.
I wonder if this has happened to other people as well. My Euthyrox has been upped to 125 from 100, so maybe it is that?
And are there other things lying in waiting for someone without a thyroid?

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The part dealing with my problem was always very supportive and helpful. I stopped using it because most of the answers to my questions had been dealt with in earlier threads. And it was a bit depressing only talking to people who were in the same boat as myself.
But, for what it’s worth, here is a link to a thread that you may like to approach for ideas.
https://patient.info/forums/discuss/browse/thyroid-and-parathyroid-disorders-2244
If you live in Derbyshire, as I do.
I think it's probably best to contact your doctor, in case the medication needs adjusting.
I live in west central Scotland - not where that photo is...
My daughter had hers removed five years ago, not a huge coffee drinker but definitely has a cup when she fancies one, with no problems.
One thought, have you not been drinking coffee for a while? We only drink decaf at home, but I’ll have a proper coffee when I’m out. If I haven’t had any caffeine for a while, the first cup does go my head!
I have a check up in a couple of weeks' time and I will ask.
Thank you again.
Luxembourg
Having been diagnosed with hypothyroidism a year ago, I was left on very low doses of thyroxine for months at a time ( and not in line with NICE guidelines!) I saw a locum GP for something else recently and decided to ask her about my dosage. She took one look at my blood tests, said my dose was still too low and organised a new prescription. Within weeks, I seem to have loads more energy and don’t need an afternoon nap. Too much of a coincidence not to be related?
Still drinking a cup of caffeinated coffee at least four times a week, with no apparent ill effects, if that’s of any help.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
It takes time and a lot of adjustment before you get the right dosage. I started 25 years ago and changed the dosage many times, now the thyroid is out and probably will take some more adjustment. I am not out of the woods yet, but at least the blasted thing is out and it was the right decision.
Luxembourg