Is this normal, my abdominal area and stomach swelled a lot after first ultrasonic cavitation treatment?

yukily.    I have not been impressed by results from this device, and I’ve seen many patients seeking traditional liposuction because these procedures did not work for them. I would at least give it a chance however and over the next several weeks to see how you progress.  Traditional Liposuction is still the gold standard. Best of luck.