Zoe,
It depends on what the arrhythmia is. First, if your blood pressure is too low, I would decrease or stop the blood pressure medication if I were to see a similar situation.
The answers to the next questions depend on whether they are treating PVCs or a sinus tachycardia (normal heart rhythm but faster). If it is PVC (premature ventricular contractions), most medications do not help much but with a normal heart they do not pose significant risk. If it is sinus tachycardia, again there is not much increased risk. Beta blockers and calcium channel blockers may help slow it down. There is no one accepted way to treat this if this is the problem.
If you aren't sure what is going on, it would be better to see a cardiologist if that is possible. Don't be surprised if they say the same thing as your internist though. In general, my opinion is that if you aren't sure if you are being treated correctly, see a specialist. Issues like this can be very simple or complicated depending on the circumstances.
I hope this helps.
I forgot to say, Tibbar, that I'm glad the adjustments you made helped you.
Thanks, Tibbar. My low blood pressure was pretty constant, as is the arrhythmia. I am now at 1/4 dose of my BP meds, and my BP is higher but still sometimes goes very low. I haven't actually fainted but have to hold on to something sometimes when I stand up.
Ironically, I myself my have discovered the answer to my problem. I was severely hyperthyroid many years ago and had my thyroid destroyed with radiation. I have taken the same dose of thyroid meds for many many years and am stable. Last year when I started to lose weight (I'm 59, I don't LOSE WEIGHT..lol) I was tested and was still normal. Shortly after that I was diagnosed with diabetes (again, I diagnosed myself and asked for a blood test). I assumed the weight loss was from that, although I have continued to lose now down by 35 pounds (I needed to!). I realize now that weight loss was not all from diabetes. When I was tested last week I am severely hyperthyroid. That can explain everything. I am on sharply cut thyroid dose. My arrhythmia isn't too much better but it's only been a week since he started to cut my meds so we'll see.
Recognizing that everyone is different...To keep my BP under 140/80 I take lisinopril...I did have an AFIB episode of 6 hours thru the night that lowered my BP to 88/58 and in the AM I fainted. Switching beta blockers (for the AFIB)and taking the Beta blocker at a different time of days seems to have helped so far.....Still stay on the lisinopril for BP.....good luck