I wonder if your fire button was working correctly before it got stuck. I repeatedly pressed quite hard on mine to see if I could get some reversible glue to stick vinyl on the fire button to match the skin I made for my VAMO. The button never got even a tiny bit stuck.
Try taking out the battery and use your thumb to gently wiggle the fire button from side to side, up/down and catawampus to see if that releases the button.
If that doesn't work and if you are comfortable taking the VAMO apart you can see if you can fix it yourself. However, it might be easy to do something that would void your warranty.
If you have no backups at all and no local
vape shops you might want to try the
njoy King disposables to get you by. I've not used them but many people have posted that they are quite good although expensive. However, that would be better than going back to smoking. Quick Trips and 7-11s are carrying them or you could use the
NJOY Find a Store.