Reaction to Numbing Cream

The jittery feeling during the treatment or jsut afterwards is probaly related to the dental block.  It usually has epinephrine in it , and that can cause this jitters. As for numbness, this may be related to swelling of the lips after the procedure and usually gets better.

It is possible to get local allergic reactions to numbing creams, but those are usually itching, irritation, redness and scaling.  In order to get systemic symptoms from a numbing cream, it would need to be applied over a large body surface area with occlusion, like a plastic wrap.

It is very possible to get an increased heart beat from epinephrine in an injected local anesthetic.  It doesn't happen often but some people are very sensitive to it.

Next time, just ask the doctor to inject lidocaine without epinephrine for a dental block.

As far as numbness is concerned, it may have been due to a bruising of a nerve during injected anesthesia.  That is usually localized to one half of the injected area.  The likelihood of both sides being bruised is very small.

Glad to hear that the lips look great and the numbness is resolving.  A few modifications should improve your experience next time.