The Web Between My Thumb and Index Finger Hurts; Last Leave Request of the Month

The web between my thumb and index finger hurts; last leave request of the month.

I've always typed on my phone, and I'm not used to typing on a computer. Now the web between my thumb and index finger on both hands hurts whenever I move it, so I'm taking the last day of the month off.

I've already bought an ergonomic chair. Starting tomorrow, I'll try writing on the computer.