The Trust GXT 144 as mentioned above is pretty much the only vertical mouse that has 1000hz polling from what I've seen. There's some others that exist on amazon but they are mainly just OEM garbage that have different names. Anything that has at least 10,000 DPI should hopefully be 1000hz if they don't mention in it their product pages.
I used the GXT 144 quite a bit and it's pretty decent. I found it comfortable to use and didn't take long for me to adjust to it either. There's a few downsides to it though.
1. Because of how you hold it, it can be a bit top heavy. Sometimes the mouse would tilt to one side especially when swiping.
2. The mouse feet were pretty awful. You might be able to rectify this with some after market skates. Dot skates would be best, just make sure they are around 0.7mm thick.
Outside of that the only thing you can do is to actually look at your setup in general.
Everything from desk height to in game sensitivity can cause pain when playing. Sometimes things like tension whilst playing can be a key contributor as well. There's so many factors that can cause pain that it's best to find out what the root cause is as you might end up going down a rabbit hole and still find no proper solution to your issue.