Myself Dr Josh- and I’m happy to help with your question today.
I am sorry to hear about your problems.
Well, It is normal to have such numbness/ pain with swelling after knee injury.
This can be due to associated nerve compression. It is not related with any serious issue.
It may take few weeks for symptoms to get disappear completely.
You should take tab Motrin 400mg twice a day.
You should Use ice packs for approximately 20 minutes, and repeat it 4-5 times a day.
You can use ace or other elastic bandage as it can provide both support and decrease swelling.
You should avoid stretching or massaging. You should keep affected leg elevated.
Also you can take Vitamin B complex supplements.
Please follow above measures, and take adequate rest.
Most likely in 1-2 weeks, you would become free from all symptoms.
Hope this helped
If you have any further question then you can ask me.
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Wishing you a very Happy New year 2017