I am literally losing my mind. He pees under things like bookcases, filing cabinets things with no legs and the only way to clean it up is to take everything out and even then it's impossible for me to move and turn heavy thing upright to clean under. Yesterday he peed on the tv legs and later he went to his favorite box in the hall when Sammy walked by. Sam gets out walks over to a rubbermaid box and pees under it. Then he got upon a table use to charge my computer and peed on the computer.

I put him in the cat cage for a few hours. He slept he ate dinner and then he started crying so I let him out.

Every morning I hate to get up because I have to hunt for pee.

We have 5 litter boxes 3 in the living room and 2 in the bedroom. We always had 4 but I moved 1 and added another.I tried to put them near pee places but I have a small place so not always possible. Like in the past he has peed in front of the fridge or the closet or the back door.

Any ideas? He has also been fighting with Sammy who can't have a box, a toy or even a brush because Sam will pee on them.

I am afraid there is something mentally wrong with him. He's 16 been here over 3 1/2 years.

It's either a physical problem (urinary tract infection, etc) or a behavioral problem. Has he been seen by the vet recently?

There is nothing wrong with his urine. I just had it tested for about the 15th time this year. He peed on both tvs and my computer I thought it might be a leg issue but he goes into the litter box and then gets out and pees on the floor or the tv or table or couch so getting up on stuff is not a problem.

I'm ready to give up. And now Sammy is sick. Something is making them sick throw up and diarrhea on top of the peeing.

Are they eating the same food or treats ? Are you using filtered water ? Any new rugs,furniture or cleaning products ? I would try the litter box cleaner from Skouts Honor & moving them to different spots as well as different food .

Ranger, I know your frustration (I guess many of us do).  I'm no stranger to pee in the house.  I even resorted to buying special flashlights that help me find pee.  I've had to throw away my sofa.  I've had to throw away some really nice cat cushions I got.  I have to cover my bed with unsightly waterproof sheets.  The boys are no longer allowed in the room that has my keyboard (synthesizer) because they've peed on it and the pee got down in between the keys.    I can't tell you how unpleasant it was for me to work on my synth during the summer months.  (   )   Don't get me started on pee in accordion doors with railing.  

For us, the pee issues suddenly start up and then suddenly stop.  Something must bug them or remind them to start marking areas, but I don't know what it is.

(I do want to mention that it's a little curious that your cats are now suddenly throwing up and having diarrhea - it might suggest they've been feeling off, or can smell the other is off?)

What I might suggest:

1)  If there are cushions or blankets that have been peed on a bjillion times, you'll want to wash those (obviously) really well.  Then what I do is I put a pet sheet inside a pillow case and put the pillow case over the cushion so if there is any pee issue, the cushion is all right.

2)  I'd cover the places that are expensive or difficult to clean with a waterproof sheet.  You could wrap the bottoms of your furniture with the sheets (while you're out or sleeping) and make it an unpleasant/difficult place to pee.  I have sets of waterproof sheets so that if I need to wash a sheet, I have a spare one to replace it while it's getting laundered.  It might look awful but the idea is to make them not want to pee there anymore.  My experience is that they do give up on the area.  I would recommend waterproof sheets because they are so much easier to clean since they absorb the pee.  I wouldn't, for example, use a plastic tarp because that will mean having to clean the tarp, tracking and leaks.

Something like this... It looks like they're called waterproof bed pads:
https://smile.amazon.com/dp/B00ZZ00G0Y?aaxitk=gh9hu5n5jwwbv5z39MMLUQ&pd_rd_i=B00ZZ00G0Y&pf_rd_p=44fc3e0f-4b9e-4ed8-b33b-363a7257163d&hsa_cr_id=3304771950901&sb-ci-n=productDescription&sb-ci-v=Vive%20Washable%20Incontinence%20Bed%20Pad%20-%20Heavy%20Duty%2C%20Absorbent%20Waterproof%20Urinary%20Mattress%20Protector%20-%20Overnight%20Sheet%2C%20Reusable%20Dry%20Bed%20Wetting%20Urinary%20Underpad%20Mattress%20Protection%20-%20Elderly%20Seniors%2C%20Kid

Hang in there!  You're not alone!  <3