In the west, we have this odd idea that meditation is only sitting on a cushion. The Buddha indicated otherwise:
MN38:36.1: They act with situational awareness when going out and coming back; when looking ahead and aside; when bending and extending the limbs; when bearing the outer robe, bowl and robes; when eating, drinking, chewing, and tasting; when urinating and defecating; when walking, standing, sitting, sleeping, waking, speaking, and keeping silent.
In addition, the Buddha has excellent advice about perceptions:
SN12.70:16.3: You should truly see any kind of perception at all—past, future, or present; internal or external; coarse or fine; inferior or superior; far or near: all perception—with right understanding: ‘This is not mine, I am not this, this is not my self.’
I don't have PPPD, but I am going blind and suffer from double vision. Heeding the Buddha's advice, I understand these double visions as ‘This is not mine, I am not this, this is not my self.’
Oddly, the distortion of perception has actually helped me understand the fickleness of perception. Perceptions come and go. They are impermanent and unsatisfactory.
Please do consult a doctor for medical conditions. And as you wait for medical resolution, simply be aware of the perceptions, using them or enduring them as they serve your practice for yourself and others.