There isn't much you can do, except maybe turn of background app refresh and completely closing any open apps not in use. The iPhone is doing a lot of background things so you'll just have to wait a couple days before it be back to normal. The battery life might even be better.
For the past week I have turned off my cellular while I am at work and use the WiFi at the nearest Starbucks/Apple Store and turn it back on when I get home. Turning off most of your notifications will also help.
I keep receiving the updates on my iMac to update my software but I have ignored it as my phone is using the most recent update.