What can I do regarding Non-Self
The scriptures (AN 3.38) report, before his enlightenment to Buddhahood, when the unenlightened Gotama lived in three palaces, he had the vision he would get old, sick &amp; die and this vision made him lose intoxication with his youth &amp; life.
Then upon enlightenment, he fully realised the five aggregates that compose life (body, feelings, perception, thought function &amp; sense consciousness) are 'not-self'; and one reason why each of the five aggregates cannot be a 'self' is because each can be subject to affliction &amp; sickness that cannot be controlled (refer to beginning of SN 22.59).
It is reported the Buddha once taught to an elderly man that:

The body is afflicted, weak &amp; encumbered. For who, looking after this body, would claim even a moment of true health, except through sheer
foolishness?
SN 22.1

Therefore, although Gotama's original vision of death as a youth resulted in great angst in his mind &amp; a long experimental spiritual search, in the end, his Buddhahood was merely the full acceptance &amp; thus being at complete peace with his original vision of inevitable decay, death &amp; impermanence.
In your situation, the place to go is the development of meditative calm (samatha) &amp; clear insight (vipassana) so the mind is at complete peace &amp; freedom with illness, aging &amp; death (rather than having discomfort with this initial vision). In Buddhism, this is called reaching the 'Deathless'.

Monks, mindfulness of death — when developed &amp; pursued — is of great fruit &amp; great benefit. It gains a footing in the Deathless, has the
Deathless as its final end (culmination).
AN 6.20