Yes, created new profile. Don't have discord. But thanks for suggestion. Beginning to think it's a weird hardware incompatibility (motherboard/CPU/RAM) because no issues otherwise. BF1942/FH is fine. Even in BF2/FH2 it's only left-right rotation in 1st person (most noticeable stationary), but not up-down. It wasn't like this in the past (apparently like most players) with different hardware but unsure of different components over time.
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Different types of RAM and CPU did not solve it, so that leaves the motherboard or BIOS - maybe a performance design gone wrong.