For a while our kitchen faucets (both hot and cold) were not working properly. Sometimes we would turn one or both on and no water would come out, so then we turn it off then back on and it would work, or water would trickle out then all the sudden go fast. Now it is getting worse and worse and this morning I couldn't get any water out at all, and I know the problem is not the aerator. Also when I unscrew the middle thing in between them both I can see water there so I know the water is getting up the lines. Any ideas?
The diverter for your sprayer is faulty. Typically, when the sprayer is used, the faucet will completely stop. Once you stop using the sprayer, the diverter redirects the flow back to the faucet. Depending on your faucet model, this part may be replaceable, and you may be able to open up the valve and find something clogged or broken inside. But I'd personally take the opportunity to replace the entire faucet. Pull-out faucets eliminate this valve, look cleaner, and leave the old sprayer hole available for a soap dispenser.