eddy current direction
Eddy currents do not stay in the same direction, nor do they always oppose the direction of the magnetic field in the primary. A good way to understand them is as follows: The eddy currents will create a magnetic field which opposes the change in the magnetic field of the primary.
Sometimes this will be in the opposite direction as the primary magnetic field, such as in the first diagram you drew of a sine wave, and other times this field will be in the same direction as the field of the primary, such as the second diagram you drew.
In the first diagram, the magnetic field of the of the primary is getting stronger. Therefore, to oppose this change, the eddy currents will create a field in the opposite direction as that of the primary.
In the second diagram, the magnetic field of the primary is getting weaker, and so to oppose this change, the eddy currents will create a magnetic field that 'tries' to strengthen the magnetic field of the primary. It is therefore in the same direction as the magnetic field of the primary.
The eddy currents in these two cases are going in opposite directions relative to one another.