giving your hand a break from texting and typing would be a good start as will give your hand a chance to rest and rebiuld if it is arthritis based
as you say you type and text lots it could be a form of repetitive strain injurym(RSI), so resting it would help this also
Arthritis i think usually comes with some inflamation where RSI i think is just pain
have you thought about using a speach recognition software, that way you don't have to type, you talk and the computer turns what you say into text, that may help you rest your hand. most computers now have one built in, look under 'accessibility' or 'ease of access' in your 'control panel' they take a bit of time to get used to but they are great once you get the hang of them. I can actually write a letter in half the time of that taken by my collegues because i use one!