I have hot water to 4 places in my house, the bathtub, the bathroom sink, the kitchen sink, and the clothes washer.

Pressure in the bathroom sink and bathtub are fine. Pressure in the washer and at the kitchen sink are no more than a trickle.

The cold water pressure is fine in all places.

The hot water tank in in the bathroom.

I am at my wits end, what should I do?

Did you try cleaning your faucets? Remove the aerorator and see if they are clogged. This is common for hard water mineral deposits.

For how to instructions read here:

https://www.askmehelpdesk.com/plumbing/where-screens-clean-kitchen-fauset-194377.html?

I did clean the aerorators and I just recently installed a brand new faucet on the kitchen sink.

I'm guessing that the hot line out of the heater splits off somewhere with one line going to the bath area and one going to the kitchen/washer area. Suggest that you look for some kind of valve on the line going toward the kitchen. You probably have some kind of restriction in that valve.

Pressure in the washer and at the kitchen sink are no more than a trickle.
Shut the water off to the faucets and open them up. Pull the cartridge and check and clean the inlet ports. Before you button up turn the hbot water on to flush out the supply and valve body. What I think has happened here is minerals built up in your water heater broke away and lodged in the first faucets making a draw. Minerals will continue to build up in your heater unless you flush it on a regular schedule. Let me nshow you how to flush the minerals out.
For long life and fewer troubles you should keep your heater clear of mineral build-up by FLUSHING NOT DRAINING on a regular schedule. Attach a hose to the boiler drain at the bottom of the tank. With the pressure on, open the boiler drain and let it run until the water runs clear. You will see a spurt of red,(rust) followed by white or yellow grains,(lime or calcium carbonate). This shouldn't take more then a few minutes. Do this monthly to keep it clear. Now flush out your hot water lines on ALL fixtures that are affected . Don't forget to flush it out every month. Your heater will thank you for it. Hope this helps, Tom

I will try these suggestions and let you know how it works out. Thank you for the advice.