Sounds like my Pouncer. He gets stressed.... then gets sick and pees. I try to keep things as normal as possible in order to keep him healthy. I will never change his prescription diet. I feed 5 cats HIS food but he remains healthy on it so its worth it. Anyway, I digress...... I had 3 solid years of Pouncer being sick. He's only 4. It was the same stuff you described. I even felt pressure and had no discomfort... took him to the vet to find out if I waited another hour my cat would have died.

I didn't read everyone's replies because I have a screaming headache just read your responses that clarified everyone's questions. Here si what I did that FINALLY made a difference:
1) Enzyme cleaner to thoroughly clean up any and all urine spots. Don't get Nature's Miracle. They changed their formula last year when they sold the formula but neglected to tell the public. Their formula's not the same and doesn't work as well. I like Simple Solution.
2) Dr. Elsey's litter. I think Petsmart is the only place to buy this. They make two kinds. Buy the "Cat Attract" first. It really works. Its more expensive but it WORKS. Then once he's using the box again, move on to the Dr. Elsey's Precious Cat litter. Again, a bit more pricey but 100% worth it because it works so well.
3) About a 100 rounds of Clavimox. A dozen rounds of Baytril til I read that too much Baytril can lead to blindness. I tried natural antibiotics. I tried everything. In the end, it took 28 days straight of Clavimox without missing a dose to do the trick. He apparently had one heck of an infection that the typical 14 day dose wasn't touching. Its been a few months and he's back to normal. I can't tell you the difference in this cat since the infection's gone away. I forgot what he was like!!!
4) LOTS of water. Water available in every room. Apparently water is VERY important to cats susceptible to cystitis. I have water available in different forms hoping one would interest him over any others.... he took to drinking from the betta's bowl. We now have two separate bettas because thats what he preferred. My vet got a laugh out of that and agreed it was what I needed to do in order to get him more water.

I swear it was a combination of more water, better litter, and an extra two weeks of Clavimox that saved Pouncer. In all, the reality of the financial burden of the whole 3 years is too much for me to add up. I don't want to know. Please give what I did a try. It can't hurt and just might make things better! If you go to Dr. Elsey's website you can download a voucher for a free bag of Cat Attract litter. I could send you some Clavimox and samples of Simple Solution cleaner and laundry detergent additive. You can get a betta fish and bowl on your own Would you please try it?