I accidentally cut off the end of my left middle finger, just behind the finger nail, last Feb. I haven't played the guitar since. Obviously trying to fret a sting is very painful. I'm afraid I'll never play again. Came across the Galaxy FT-1 finger protector and am wondering if anyone here has any experince or knows someone who has experience with this product.

I'm not sure about that product in particular, but are you familiar with Tony Iommi? If not, look him up. He chopped the tips off of his entire fretting hand and fashioned himself prosthetic "thimbles" to play with. Now a company produces them for him, maybe look into those and see if they are available for sale?
I'm just a kickin' and a gougin' in the mud and the blood and the beer.