It could be some sediment has built up. Especially if there has been work done on, or the municipality has flushed the water lines in your area.
Take off the showerhead. Soak it in vinegar or lime away (vinegar works if your water isn't too hard.)
If you can do this without flooding your bathroom, while the showerhead is off, turn on the water to flush out the pipe. Hopefully this is the problem and it will do the trick.
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