Just to focus on the spiders, look at all the ways this fear is causing your life to be restricted! If you could remove this one fear, so many other aspects of your life would instantly open up for you. This one change could make an enormous difference.
Yes it won't be instant. It will take a while. That's fine! The things in life worth having usually take a while. There's no need to rush. Take tiny little steps towards it and celebrate each one.
For now, try reducing the length of your scream. Sure, you'll probably scream when you first see it. Then take ten deep breaths. Breathe and focus on those breathings. That is all you need for the first step. Screaming more doesn't help in any way .