{{{{{Fister and family}}}}}
Randi, I sure hope Fister is fine and back to normal soon. Our Scooter has a devil of a time with UTI and I feel so sorry for the poor little guys! He's had to stay in the hospital several times with his 'bouts' of UTI, but he seems to be doing fine now Hopefully Fister will be up and running (pardon the pun) like our Scooter soon!
Did your vet put him on a special diet? If not, be sure to ask about it. Scooter has been put on the Hill's Science Diet prescription for UTI, which should help prevent recurrances of UTI and crystal formation. The only drawback to that is, he has to be on it for the rest of his life, and it's quite expensive. But, as you know, it's worth it

**hugs** to you and Fister!! I'll say a little prayer for you guys and do keep us posted.