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have the valve seat rubber replaced

Your expansion tank need air. Bladder might be ripped.either u replace the tank or you drain it cometary and add 12 psi of air

The overflow pipe should be attached to a small clip that holds it in position over the over flow pipe. If it is loose or attached to the outside it will do what yours is doing.

Run a short snake thru the line. Somewhere between the drain and the tee into the line with the sink is a clog.

Be sure to pull the plunger all the way up when diverting the water between the the tub and shower if ti keeps giving you a problem it's faulty

depress and release button and whirlpool will stop