2 * 0 = 0

Doubling the mass of photons is no change.

Repealing Bournoulli's principle requires changing how kinetic collisions of molecules translates into bulk measurables like pressure and density. There's no way to predict what that does without first specifying more about what changes are made.

[note: I thought the OP said "proton"]

Best case? atoms shrink slightly and some changes to how chemistry works

Realistic case? The change in nuclear binding energies renders protons unstable, making many elements unstable or radioactive. All matter suddenly becomes much heavier, changing gravity and internal pressure, which in turn disrupts stellar and planetary structures. Fusion reactions depend on precise mass differences between particles, which may alter how stars generate energy, or completely prevent them from forming altogether. Additionally, since proton mass is tied to the strong nuclear force, it will fundamentally alter physics, and it's likely that protons will decay into neutrons, preventing atoms from existing at all.

The first wish would affect how fluids act under pressure, including how our blood would move throughout our bodies. Depending on the exact effects, the wisher may not even get the chance to make the second wish because their blood would either stop moving, or they would drop to ground as every capillary in their body ruptures causing an immediate loss of blood pressure, quickly followed by loss of consciousness and then death.

IF they live long enough to make the second wish, then they probably wouldn't live long enough to make the third.

Who says pi has to be a constant at all?

Are you an orange cat?

I have a feeling you'll love tau.

I was talking more about physical constants, like magnetism, gravity, planck, etc. But sure, mathematical ones work, too. Probably even worse than physical constants doubling, since the doubling of mathematical ones would imply the corruption of reality itself.

Wait, have we just been living inside the worst possible Star Trek episode this whole time?

There is, afaik, no explanation why there is more matter than anti matter, so maybe we just don't see it

Like, dark side of the universe or something ;⁠-⁠)

This is the baryon asymmetry problem, and indeed, one of the proposed solutions is an "anti-universe" that flows backwards in time. The theory goes that all the antimatter travelled backwards in time while matter travelled forward from the Big Bang, creating a mirror anti-universe. However, there has been experimental evidence against this theory, as antiparticles seem to move forward in time, just like their matter counterparts.

There are a bunch more theories on how matter dominated the universe, like electroweak baryogenesis and leptopgenesis! Those are a bit more complicated though and are difficult to explain in an internet comment.

Imma go ahead and postulate that beyond the observable universe is a wall of anti matter, that keeps eating our universe's matter and neutralizing it.

Prove me wrong! (Don't.)

I thought Madam Wu's experiment provided a starting point for explaining why the universe exists despite its best efforts to annihilate itself. Disclaimer, I have passing interest in physics but I have no formal education on any of it.