@Tootels Try not to be anxious, you'll have 24 hours notice of any planned power cuts, so you'll have time to figure out whats best for you to do, to help you cope in a way that won't make you feel nervous or uncomfortable.
Here's some ideas of what you could do:
Buy a food flask (Argos have some reduced to £6 currently) - you can use it for soup/stew or hot dogs, and they'll keep warm for 6 hours
Cook in a slow cooker - as long as you don't remove the lid, it should stay warm for up to an hour, so if power goes off at 4, you just eat by 5pm
Buy just add water meals, like pot noodles and cuppa soup, that you can just add hot water out of a flask to
If your nervous about cooking in advance, try eating your hot meal at lunchtime, and just having sandwiches at tea. If you have a flask of coffee/hot chocolate to go with it that'll help you warm up
And if you really feel like you can't cope with any of these suggestions, then just have a few ready meals on standby that you can microwave when the power comes back on - its highly unlikely to be off for more than 3 hours at a time, so you could just eat a little bit later once the power is back on.