My first thought was "relax". You stated you`ve just started diving AND you went on a deep dive. I`m sure you were nervous and apprehensive, that`s normal. Talk to your Instructor. Granted, there are a lot of other possible contributing factors. Same BC? Wet/Drysuit? Salt/freshwater? Depth? Visibility? How did you feel before/during the dive? Etc. My biggest question would be: If it`s against the law to drink and drive, why do lounges/pubs/taverns have parking lots?