I had numbing cream on lips, my tongue also was numb. Had a bad chest next morning.

There's nothing wrong with starting with a 1/2 syringe and adding more later if desired. However, based on what I see in your pictures and my experience, you probably won't get much of a difference with just half a syringe and will likely want the full syringe. The most important thing is the...

Yes , but 1 syringe is very small if done right this is subtle.  I suggest you go to an expert.  Best, Dr. Emer.

Volbella is a thinner filler and Ultra Plus is thicker and will give more volume. Lip filler results take 1-2 weeks. I hope this helps. 

Yes, there can be swelling, but since you have redness, I recommend following up with your injector for a formal evaluation. Best, Dr. Emer

According to your photos this does not appear to be necrotic tissue, just normal bruising. Apply some Arnica gel topically and use ice. It typically takes about 10-14 days for all the filler to settle and the tissue to heal from injections, so be patient. Report back to your injector immediately...