Steam extremely loud and vibrating throughout the house

I moved into my Brooklyn house a year and a half ago. We have steam radiators. The boiler is in the left side of the basement. We are in middle of our second winter here and whenever the heat goes on it always makes loud banging sounds throughout the house. There also is a cauldron boiling sound that we always hear in the middle of the house mainly on the second floor when the heat is on. The left bedroom (2 floors directly above the boiler) gets overly hot to the point that it’s unbearable without the bedroom door open when the heat is pumping. In contrast, the right bedroom doesn’t get hot enough. The middle bedroom gets hot and that is the noisiest room. The floor in the middle bedroom also slightly sags. The dining room which is directly beneath that middle BR also has a couple of line shapes across the ceiling which are soft to touch (possibly indicating some water damage at some point?) but no moisture was detected there when we checked it a few weeks ago. Just this past Thursday night, we heard an unusually loud banging/thumping sound reverberating throughout the house coming from the middle BR. Although the steam is always particularly noisy in that room, this time it was much louder, it had a thumping sound and sent vibrations throughout the house. It sounded like something might break or explode so we shut the heat switch off on our thermostat. We were away Friday night and Saturday and returned Saturday night. We left the heat on 65 before leaving but upon returning, the temperature in the house was 58 and the heat wasn’t going. I saw that the pilot light was out on the boiler. We called a boiler guy that night who replaced the thermocoupler. The heat then worked nicely for around 3 hours until that loud vibrating thumping that we first heard on Thursday night began again. We never touched the vents in the radiators in the house. Does anyone know what the problem may be?