@Sister you might be just fine! It’s unpredictable.
My effects started about 15 hours after I had the injection FYI. I woke at 4am with headache coming on and a great thirst - I should have had lots of water and a couple of Panadol and a nurofen then, but it was 4am so I waited until morning, and by that time it was like a migraine or a bad hangover.
So I suggest keeping water and headache pills near the bed, so they are easy to find if you need them (which you might not).
I’m a big believer in staying on top of the pain normally.
I also had it in my right (dominant) arm which they say might get a stronger reaction 🤷🏼♀️. But I didn’t want to get it on the breast cancer side.
The symptoms all departed as quickly as they came on though, and now I am vaccinated, hoorah!! 👏🏻👏🏻👏🏻