We recently underwent a renovation of existing second floor bathroom. The shower has a main head and a second hand held. The pressure is so low that the handheld doesn't work. The main head is also very low. We have a sink and jacuzzi in the same MBR and a second bathroom very close by that all work fine. None of them have great pressure, but definitely adequate.
We have our own well for water and the pressure gauge ranges between 30 and 52.
The house was built in 1964.

I am planning on speaking to plumber tomorrow, but wanted your advice on why this is happening and what can be done to help it.