Serious side effects and or withdrawals after just one day?

I was prescribed Gabapentin - 300mg 3x daily for chronic back pain. I picked up my prescription around 2pm and took the first dose and then about 7-8 hours later before bed I took my second dose. I started to feel very odd to say the least. I started to feel anxious and a bit of paranoia and no relief from the back pain what-so-ever. I woke up the next morning feeling strange still, ate a small breakfast and I wanted to do my due diligence so I took a 3rd dose. Just hours later I started to experience effects I've never felt before in my life. I felt as if I was so disassociated , I was on another planet. I've never had a history of anxiety and that was through the roof. I was forgetting things that I had done or that had happened just minutes/hours prior and my heart rate was over 160bpm. I was at work while all this was going on and my boss could see by looking at me that I was not okay. He wanted me to go home but I did not feel able to drive. I laid down for about 2 hours, while the entire time I could feel my heart beating out of my chest and even resting my BPM did not go down. I made it home and things did not get any better. My chest felt like it was caving in from the anxiousness and paranoia and I would have some dark thoughts cross my mind. I knew at the time that this medicine was causing these things so I was able to keep it together and not panic at the depression or thoughts but it was something that I had never experienced before in my life. I had to listen to my body and did not take and have not taken another dose since that 3rd one.

For about 15 days after, I had what I'd call crippling anxiety, my chest would feel like it was caving in, shortness of breath, mind racing, unable to sleep, mood swings, more paranoia and still a feeling of disassociation.

It's been exactly a month now since that first and only day of taking Gabapentin and some of these effects have still not fully gone away. They aren't there 24/7, besides maybe the tight chest and shortness of breath, but the anxiousness and mood swings come and go a few times a day. It's almost more irritating now knowing that Gabapentin is what has caused this because I had no feelings/symptoms of these before, and wondering when I'm going to feel 100% back to normal again.

Has anyone experienced or know anyone who has experienced these things after just 1 day of the recommended dose?

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