Clunking noise when accelerating in drive

I have a 1994 Toyota Camry with over 200,000
miles on it. For a while, the car has been violently
shaking only when I accelerate. The shaking is not
noticing until about 40 mph and grows in intensity
as velocity increases. I have been led to believe
this is a CV Clamp, which I have plans to fix.
However, just last night my car suddenly started
making a very loud clunking noise when I press the
gas pedal in drive. It starts loudest when I first
press the gas from a stop, and grows quieter and
faster as velocity increases. It seems to be in time
with the cadence of the wheels. Turning has no
effect on it whatsoever, and it does not make the
noise in reverse, park or neutral no matter what I
do. The only thing at all that seems to make the
noise or have any effect on it is pressing the gas
pedal in drive, and the velocity of the car.
I've read a lot of posts that sound similar where
people say engine mount, but I can't imagine why
the speed of the car would matter nor why it would
only do it in drive, same thing with wheel bearings
or anything with the wheels (shouldn't reverse
make the same noise if it is with the wheels?)