sich erholen
to recover
To regain strength, health, and inner calm after exertion, illness, or a shock.
Im Urlaub am Meer konnte ich mich vom Arbeitsstress gut erholen.
On vacation by the sea, I was able to recover well from work stress.

to recover
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to recover
To regain strength, health, and inner calm after exertion, illness, or a shock.
Im Urlaub am Meer konnte ich mich vom Arbeitsstress gut erholen.
On vacation by the sea, I was able to recover well from work stress.

'Erholen' (to recover) is a reflexive verb and is almost always used with a reflexive pronoun (mich, dich, sich, uns, euch). Man erholt sich (one recovers).
Du siehst müde aus, du solltest dich dringend erholen.
You look tired; you urgently need to recover.
The prefix 'er-' is inseparable. It remains firmly attached to the verb 'holen' (to fetch) in all tenses and sentence constructions.
Ich hoffe, dass sich die Wirtschaft bald wieder erholt.
I hope that the economy recovers soon.
When stating the reason why recovery is needed (e.g., an illness or stress), use the preposition 'von' with the dative.
Sie muss sich noch von der Operation erholen.
She still needs to recover from the operation.
You can recognize this figurative meaning by the fact that the subject is not a person. It usually involves abstract or economic terms such as 'der Markt' (the market), 'die Preise' (the prices), or 'die Natur' (nature).
Der Wald erholt sich nur langsam von dem großen Brand.
The forest is recovering only slowly from the large fire.
to fall ill
'sich erholen' and 'erkranken' both describe a change in someone's health, but in opposite directions. Someone who 'erkrankt' becomes ill or contracts a specific illness. Someone who 'sich erholt' becomes stronger and calmer again after illness, stress, or exertion. 'erkranken' fits the beginning of an illness; 'sich erholen' fits the time afterward, when things are getting better again.

Nach der langen Fahrt erholt sich der Fahrer am Abend im Hotel.
After the long drive, the driver recovers at the hotel in the evening.
Viele Kinder erkranken im Winter an einer Grippe.
Many children contract the flu in winter.