My cat is experiencing pain

I am currently sad because a cat that belongs to me is suffering from pain in the legs, so he can not walk as usual due to limping.

I don't know the cause of why the leg is injured, I only saw it two days ago when this cat was only lying in bed for a whole day not going anywhere..

Seeing his illness, I was unable to do much to help him because I was not a veterinarian, but I still tried to feed him so that the cat returned to power as before.

At night, I covered her body so as not to be bitten by a mosquito, I feel sorry for the suffering experienced by my beloved cat and my entire family...

Thank you