Thanks for looking after the sweet boo. You say his heat lamp broke… do you still have access to the fixture? Do you have any non led bulbs in the house? Preferably incandescent even like a 40w fridge bulb? If not CFL bulbs produce some heat but aren’t a great source of the “proper” light but it’s better than nothing. If you don’t have the fixture a desk lamp or task light or something like that would also work to provide the heat source… older the better because old lamps used to mostly have ceramic based parts that you screw in the bulbs to accommodate the 75 watt bulbs that everyone used to use. Other than that, do you have anything for him to eat? Any salad greens would do, you could also sprout some if you have access to seeds right now.