Please Help! Ive been having trouble with my hot water in my shower. All of the other bathrooms have hot water except this one. I use to have turn the handle all the way to hot first to get my hot water but now I do that and nothing.. its freezing cold. I don't know what it could be. I absolutely do not have hot water in the tub or shower.

But I assume you do still get cold, right? Most likely a clog in the hot inlet of the cartridge. It is a single handle valve, right, what brand? You need to remove and clean the cartridge and flush the line. Instruction will vary with brand

I believe the brand is a Kohler. I do get cold yes, it just stopped working altogether today. The last couple of days, turning it all the way to hot worked and then I had to adjust the temp but now no hot at all.

Try to determine which one you have KOHLER: Bathroom: Bath & Shower Faucets: Why KOHLER: Planning Shut off the supply lines, remove the handle and cartrdige for cleaning. Place a towel over the cartrdige opening and hold firmly while someone else opens and closes the hot supply, this flushes the line of further debris