My cat is a male 3 yeaars old his name is greece just 2 weeks ago I was looking for him found him under under my bed, which is normal he always lays there I pushed some temptations under for him and he wouldn't get up to eat them he just moved his head to eat them, so I immedatly grabbed him and picked him up seeing what was wrong I thought maby he hurt his leg and couldn't get up, but he was soaked and so was under the bed he had peed all over himself he did get up and walk around but he didn't seem quite like himself I cleaned them off and the next day he was better and using the litter box. I wennnt away and came back last night and woke up this morning and he did the same thing, under my bed he's walking around and he's going to the litter box still but he's peeing a little bit like all over my house and he wouldn't eat his treats, he doesn't seem like he's in pain, but he did let out a loud meow once. Im not sure if thish would be a factor but also when he was 6 months I had him fixed, about 6-7 months later his tummy started sagging almost looks like a female cat after having kittens and there stomach sags. Hes still young I'm not sure what's wrong but I'm getting extreamly sad and worried any help pleaseee!

You need to take your cat to the vet. He may have a urinary tract infection, which is something you don't want to leave. If you leave a UTI long enough and they have crystals, the crystals can bunch up in the urethra and he will become unable to pee (aka blocked). Blocked cats have a very high risk of dying if it is not caught fast.

Is this common for it to come and go like that though? Do you know how much something like this could cost?

I cannot give a good estimate as its different depending on where you live.

But trust me, treating a UTI now is about 500x less expensive then treating a blocked cat if you wait.