Thank you for asking your query.

The pricking pain you are experiencing is typical of Eustachian tube inflammation. Eustachian tube is a small soft tissue tube which connects your inner ear to the nose.

It seems your left tube is bit congested and inflamed causing pain while moving jaw, or chewing or even yawning. This could be due a allergic reaction or due to an infection.

I would recommend you to the following.

1. Steam inhalation thrice daily. Tolerable level of heat. You can use a steamer if need.
2. Cover your ears/head during sleep or when exposed to cold
3. Occasionally swallow your saliva. This movement will open the E- Tube and relieve the pressure.
4. A warm washcloth or a heating pad set on low can help with ear pain. Put a cloth between the heating pad and your skin so you don't burn your skin

Try these measures at home. Even after 3-4 days if there is no improvement of the symptoms you need to visit a doctor /ENT surgeon.
Thank you

Hope this helps.