Anxiety or a real problem?

I have been taking this for about a week and a half and I felt completley better until last night

I got extremely nauseous so I took a shower and I could barely stand. I started having heart palpitations so bad it felt like my heart was completely stopping. Then my arms and jaw started uncontrollably shaking. I went to slepe and woke up and called my doctor. They told me to come in today but I still have 2 hours before my appointment and my jaw has started to feeling tingly and tickled again and my chest hurts really bad, starting to have weird anxious thoughts.

The medication felt like it had cured me completely and now I’m scared this feeling won’t go away and I’ll be back at square one. Is this normal??