What Causes Nervousness And Nausea While Being On Deseryl?

Hello I will try to make this fast. I recently begin taking Deseryl approx 2 weeks ago. I have noticed a better mood and attitude change, however I have also noticed little things that didn t cause too much concern like, nervousness, and nausea. The one concerning symptom I have noticed is fast, irregular heartbeat. On monday 2 days ago I had to take a national exam (which I did pass surprisingly), anyway, about 15-20 min into the exam I had a horrible experience I have never experienced before or after it happened that once on Monday. I first noticed the norm fast irregular heartbeat that quickly turned into pounding heartbeat with a feeling of severe pressure in the chest, nausea, sweating, tremors, dizziness, muscle tension, and feeling very ill and faint, lasted for quite a while over an hour or two. Then only the nervousness and nausea with headache. I am concerned it is the Deseryl because I was terrified when I got home Monday and went online to look up my symptoms and possible causes. Still uneasy about everything so I am trying to find out some professional advise (2nd advise). Got some advise today from an attending physician who told me to not stop taking the medication because it may cause more harm, and to wait until I see my doctor in 2 weeks and let him know everything. What should I do???