Why Does my Chest Feel Like Its on Fire?

This is not uncommon. Your nerves may be regenerating, causing this sensation. Your skin is also stretched at the moment which may be contributing to the feeling. This will all go away in the days and weeks following your surgery.

    Burning sensations after 2 weeks are typically normal responses to surgery.  A physical exam can rule out anything else.  Kenneth Hughes, MD HughesPlasticSurgery Los Angeles, CA

You have addressed most of what I would ask you so I think you are left with this is just the healing process. I do have patients say they feel burning in the chest as the implant is stretching the muscle over time. The skin will stretch as well and depending on how tight your skin envelope was it could be a great deal of stretching over time. I do think you should see your surgeon to make sure nothing bigger is going on.

Dyesthesia is fairly common after breast augmentation and often due to swelling. It usually gets better with time.  If you are having pain associoated with it, I always get concernced for a causalgia which is more pain like and often requires the experitse of a pain specialist to help resolve this. Speak to your surgeon.

There are all forms of new sensations that you will feel while recovering from breast augmentation. Try not wearing the bra or a softer bra for support only until these feelings go away.