Atenolol

I am 20, I have hypothyroidism, anxiety, depression and allergies. I’m currently taking Xanax .5mg, levothyroxine 25mg, and Claritin every day. So... I have have a lot of anxiety around my heart. I struggle a lot with chest discomfort, high heart rate, Palpitations, shortness of breath, and vertigo. Over the past 6 months i’ve had lots of tests done, including blood tests, EKG's, echocardiogram, stress test, chest ct (for my lungs, they actually thought I had a pulmonary embolism at first) and most recently a 24 hour holter monitor. My cardiologist couldn’t find anything wrong with me besides my episodes of sinus tachycardia I get when I’m stressed/excited/dehydrated/etc. My heart rate can get quite high, up to 160 when its really bad. He said I could try taking 25mg atenolol when I have these episodes. I took my first pill yesterday because I was having one of these episodes, and it worked great for my heart rate. Unfortunately though, it lowered my blood pressure too much (Systolic was anywhere from 105-85 when I checked) and I called the doctor to ask about that. He told me not to bother taking it if it’s gonna make my blood pressure that low. I’m kinda stuck now though... am I just supposed to wait these episodes out then if I can’t take a beta blocker ? And can that one dose I took give me withdrawals or would I have to had been on it long term? I’m really nervous about the whole thing and I feel pretty alone right now. I am not sure what to do?

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