More loose skin and wrinkles after lipo under chin. What is the next step to improve this?

Recessing your job will change the angle between the jawline in the neck. Post a photograph with the jaw and neck in the neutral position for better opinion.

I see no reason to stop birth control pills in anticipation of such a minor procedure is liposuction of the neck. Nevertheless this is a question best addressed to your own surgeon.

If you're referring to nitrous oxide as laughing gas it will not cause cardiac arrest. The dissociative feelings you had are common with any central nervous system anesthetic.

You may benefit from liposuction done within your doctor's office. During your initial examination, your #chin will be evaluated along with the neck and jawline. A weak #chin implies a lack of chin support for the skin along the neck line. In younger individuals a chin implant alone is usually...

Liposuction of the chin and neck is easily done with local anesthesia only. General anesthesia is not indicated. Anxious patients can be given a bit of oral sedation prior to the procedure.

Based in your description is possible you can benefit from liposuction of the chin. This is a physiologically trivial procedure the can be performed under local anesthesia.