I had ultracet for my back pain and accidentally drank off half bottle cough syrup instead of 5 ml as I had not used the measuring cap. That day I got lot of giddiness and heart palpitations which got settled after 2 days. However last night as well had the similar episode. Was feeling slightly giddy and palpation was there. Bp was normal and ecg had bmp of 100. Its a feeling like when you get scared. Please advise as I have 2 kids and I am very much worried.