Ok, just gonna say this: you NEED to read the husbandry 101 stickies and how to set up an enclosure stickies.
With that much temp fluctuation I'm guessing your heat sources are NOT regulated by a thermostat?? This is the most important tool you can have to create proper husbandry. ALL heat sources should be regulated by a thermostat to prevent dangerous heat spikes which can cause serious burns or worse to your snake.
I strongly suggest just starting over. Start from scratch like you literally know nothing. Read read and read more. Get a proper enclosure (yours is way too tall, which makes heat and humidity difficult to maintain). And set it up properly. Introduce the snake to the new enclosure once it's properly set up. Wait 2 weeks (NO HANDLING during this time) and offer again. Limit the wiggling and just let the mouse slowly "crawl" up to the snake. Hopefully this helps
Don't get discouraged. BPs can be tough to get going, but with a proper enclosure, proper equipment and hides and proper husbandry it gets a LOT easier. Once everything is set up and dialed in its just maintenance.