The ornamental design for an anti-migraine device, as shown and described.
FIG. 1 is a perspective view of an anti-migraine device.
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the anti-migraine device and form no part of the claimed design.