Web I started my clinicals in nursing school I would get dizzy, sweaty and lightheaded during report, before even taking on the patient. I almost passed out a few times with people asking if I was pregnant(definitely was not the case), or if something else was going on. I had no real pertinent medical history, but went to see my doctor. I was terrified that if I couldn't get through one semester of nursing school, how could I stand a career in this field that I have always wanted to do? Well my doctor said it was probably just anxiety and maybe some low blood sugar and recommend a high protein diet and a SSRI. I gained a lovely 40 lbs that year, and was able to finish clinicals without hitting the floor. I graduated and started work on CTSU with just a few episodes of the dizzy spells. After 2.5 years of nursing I did notice that my HR was chugging along around 120 all the time, and I again chalked it up to anxiety(my dad had just passed away at 61 and my best friend had lost her baby at 8 mo pregnant 2 weeks after my dad) as well as still holding on to some of that glorious weight I had gained. One night I was sitting on my couch watching Teen Mom and I felt my heart was racing, but wasn't related to the MTV programming. My boyfriend at the time(now husband) was working and is a medic so he said come by and he would do an EKG. Well my heart was racing along around 145 and sustained that stable sinus tach. I made an appointment the next day with cardiology. They did an echo and that showed a floppy atrial septum and said I probably had a PFO. My mom was with me(I was 27 at this time and still wanted my mom), and our jaws both dropped. No one had ever said anything to us back in the 80s about any heart issues. So then comes the insurance fight to have my PFO closed, fast-forward a year and my heart procedure is finally approved. They were going to put gore-tex in my heart via the cath lab. During the procedure they actually figured out it was an atrial septal defect, but were still able to repair it. Because of my ASD I wasn't always getting the most oxygenated blood flowing around, and add in the tachycardia only compounded it. Looking back I believe I was probably in SVT those times and just not getting flow like a normal person. I have been a nurse almost 5 years and I now work in PACU at a Level 1 trauma center and am beta-blocked with only mild shunting with valsalva. Long story short: many congratulations and I definitely understand your plight!