Ok, I was hoping my second paragraph would help you realize that if such damage exists it’s
- Very rare and
- Only going to happen to people who aren’t like you. You have a perfectly clear ECG and heart scan.
But I see the parts that hit you were “reports” and “damage.” And believe me, I do understand that’s how health anxiety works. So…
Beta blockers work by binding to two receptors, those for adrenaline and noradrenaline (fight or flight, basically). They’re meant to help smooth irregular muscle contractions from your heart OR slow them down if they’re too fast. The only people who have suffered what I would say are serious problems are those who have overdosed. (And in case you’re worried, you are VERY, very far from an overdose amount). In fact, the problem has been the opposite - in 2012, a large study discovered they weren’t effective enough, that by themselves they didn’t cut down on the risk of death (and if you have heart problems, you also likely take an lanticoagulant, statin, antihypertensives, and all of those will protect you). Actually, the people at some risk are people who have the OPPOSITE condition than you: bradycardia, or a heart slowness. Which you just don’t have.
What was your heart rate when they told you that you had sinus tachycardia? (sinus means that it’s still in a normal rhythm so you shouldn’t be in danger, though you may have discomfort and obviously you have fear). As I said, as of right now, your resting heart rate is high, but it’s not tachycardia and it’s not even abnormal. I mean, Fitbit reports that the normal heartbeat range for its adult users is 50-90.
blog.fitbit.com/what-your-resting-heart-rate-can-reveal-about-your-health/
I know it probably feels quite scary, but you are not in danger.
I hope this helps. I’m still working on the math. Unfortunately, since we’re trying to make these numbers out of only 2.5 mg pills (who came up with that? It limits you to only decrases by 1.25 or 0.625, requiring math), it’s probably going to require cutting the pills in 4 and 8. While waiting for the pill cutter, if you’re starting to have issues, instead of your 1.25 dose, which I assume you’re getting by cutting your 2.5mg pill in half, do this.
- Cut the pill in half for your 1.25mg dose.
- For the other half, take a knife and engrave s line near the middle of it, like a scoring mark that would already exist on a pill. Then take a sharp knife and press down while “sawing” along that kindly. If it’s not exactly half of the 1.25mg half, that’s fine. You will be taking the other “half” tomorrow night and you will not overdose since you were already taking 2.5mg before.
As I said, I hope this helps, sincerely. We’re at the limits of my knowledge, sorry. I’ll keep trying to do the math and post when I figure it out, probably tomorrow.