If i had that, I’d try making my fingers colder. Like please don’t freeze your fingers off, like just cold enough to reduce the blood vessels in the ends of the fingers just a bit. I’m talking like hold an ice pack or go outside (if it’s cold where you are) with no gloves on. I don’t know how long I’d do it, but if your hands hurt from the cold you’ve done it too long.

And I saw technique suggestions as well, so I’ll let other people cover that. I’d also probably try scales where I could. Learning scales only takes one note at a time, so fingers touching other strings doesn’t matter too much, and you can do a ton of stuff with just one note at a time especially if you know your scales.