Hello, I am new to this section. I have been diagnosed with Spinal Stenosis and was taking 120mg of Roxicodone a day. Roxi is oxycodone with no tylenol. Anyway, my doc up my dosage from 60mg a day to the 120 about 2 months ago. One night I took 150mg instead of the 120mg. I began to think about overdosing and before you know it my heart started beating weird. I got up and tried to walk it off and boom my legs were weak and I began shaking all over. I almost went to the ER but since I have always had some anxiety I got on the internet and read and finally convinced myself that I was having a panic attack. I was the WORSE thing that I have ever had. I went to the doctor the next day, didn't mention pain meds, and he confirmed after a EKG that he thought that was my problem. This woke me up and I am down to only 30mg a day of the roxi. I AM quitting. But now even at this level when I take the pill I began to listen to my heart and my breathing and I start having shorter breaths and before you know it my heart is pounding. Not racing but pounding. At night if I have taken a roxi then it is horrible. Do you think that this is anxiety, or an allergic reaction to the meds, or something more serious. I used to be on Zoloft because I worried all of the time, but I have never had this much trouble with anxiety. It does run heavily in my family. Please respond as this really worries me.