My sink runs fine, my sink sprayer runs fine, however, the head is loose and whenever I try to use it or sometimes even when I turn the water on, the head pops right off and water goes everywhere. Is there any way that I can secure it to the hose? Or do I need to replace it? If I have to replace it than will I have to replace the whole system or just the head? Please help, I can't do dishes with water spraying all over the place.

You can buy just the hose with the sprayer attached and change out the old one. I did this and it's easy and costs less than $10 depending on which sprayer you get. Once it starts acting up like that time to replace it. You don't have to replace the entire faucet - just the sprayer and hose. Or you can disengage the new sprayer from the hose and just replace the sprayer if the hose is okay. Can't buy just the sprayer though but the hose comes undone real easy. You might just end up doing like I did and just replacing the sprayer and keeping the hose as an extra.

It sounds like you lost a part a little ring clip maybe yes you can buy just the sprayer and hose.