ER visit, no results

I can't seem to get a diagnosis of what is the problem? I am a 35 year old female, 5' 8", 240 lbs.
I have flip/flop spells with my heart, some feel like brief really fast beats that are weak then a bigger one slams it back in place, others are just a second or two and flip flops. I have high blood pressure, and take atenolol  50 mg. Over the years since i was about 16, now am 35, they would happen about twice a year when I was tired and fixing to get a cold. Then in July of 2010, I started having up to 10 of these spells a day. One evening everything went crazy, I was sitting down to dinner with my family and I felt light headed,my face flushed, my whole body tingled, I broke out in a sweat literally from my head to the tops of my feet and my blood pressure shot up around 170/100. I went to ER and they thought that perhaps I had too much Levothyroxine in my blood, well next day I went to see my dr and yes it was too high, so we lowered dose and things got a little better over next couple of weeks, the episodes of flutters seemed to decrease to less than 4 a day, some days none then the next day I would have several.  I had a 24 hour holter monitor that showed no abnormalities. I had an echo which showed a very mild mitral tricuspid valve regurgitation but was told not to worry about it. Last night starting at about 6 I just didn't feel right, my bp was up just a little, 130/88 and pulse was around 90-100. I felt like I was going to get the stomach flu- I was sweaty and felt like I needed to throw up. I went to the recliner and started to feel better. at 10 I went to bed, laid down on my right side and was almost asleep when I had this overwhelming dizzy felling and had to set up. My pulse started racing so fast that it was hard to breathe or talk and my bp was 170/100 with pulse between 140-200 (as far as my bp home machine would register) I can usually cough and get the rhythm back to normal when it flip flop races, but this time it DID NOT WORK.  I went to the ER and by the time I got in a room and hooked up it was better, probly lasted about 20 minutes.  My ekg was normal and pulse around 90 with bp back to 125/85, then by time I got out of the hosp, 2 hrs later, my bp was 118/77 and pulse 83. My labs all come back,no elevated t3 (or what ever t they measure) and not dehydrated, all like potassium etc normal I am thankful that it was over, but how can you get a proper diagnosis of this when it does NOT happen when you ARE hooked up to a machine? The dr told me it was anxiety, why do they always claim that?  I know it was not anxiety, I know what I experienced, but why can't they find out what is causing it? Also, occasionally I have sharp pains in my left breast that you can put a finger on because it is in a spot about the size of the tip of my index finger. Also, lately I have felt like my legs are swollen (even though they aren't) and they feel heavy, occasionally. Also I sometimes feel as if I can't catch my breath, which I was experiencing at ER last night, but my O2 stats were 100. Nurse said my dizzy/ light headedness was to much CO2, but they didn't measure it to see if it was or not.
I avoid caffeine, so I know that was not the cause. I take my meds: atenolol 50 mg, levothyroxine 175 mcg, nexium 40 mg, Triamt/hctz 37.5-25 (this one I just started yesterday and thought it might have caused it, but they said no.)

have a mother and brother with valve prolapse, youngest brother who has tachycardia spells so bad that machines won't register his pulse(he also takes thyroid meds, but is very physically fit, lifts weights) my mother, father, oldest brother and sister and my self all have high blood pressure and take meds. My father is also a diabetic. We do have a history of heart disease, grandmother paternal died of heart attack and had CHF, grandfather maternal died from same thing. mother and grandmother and great grandmother, all maternal, have had blood clots in legs, grandmother and great grandmother had leg amputations and strokes.
Basically from a genetic point of view I am a ticking time bomb.
I'm just at a loss of what else to do?  Do I just wait for death? No one will help.

[vienna13]

Dear girl, 109 kilo is way tooooo much. You must start to work on that today. That is about 172 cm, you should not be much more than 70-75 kilos. You are over 30 kilos overweight.  Sorry I really don’t mean to be harsh on that, but you will have lots of problem because of that, as you say you DO.
In your BEST interest you must do something about that.

All your tests are good. Be happy about that and start to walk for hours and hours. If you afraid to faint best thing to walk just around the house or even inside your home.

Best of luck from my heart!