I'm on 85mcg T3 only and for many months now I've felt that my body needed more T3.
I would struggle with energy in the afternoon and sit down a lot plus be tired and unable to do much in the evening. The reason I didn't take more T3 was because I was getting some irregular heartbeats when I lay down at night to sleep. Occasionally I'd even get a few in the evening after dinner. None of them were wildly crazy but they were there. And I want to take care of my heart and my long term health.
Although too much T3 does can definitely cause irregular heartbeats I began to wonder if something else was causing them. I had no other symptoms of over medication and I wondered how I was getting these "irregular heart beats from over medication" when I felt such tiredness earlier in the afternoon and evening that seemed to be under medication.
So I started cutting things out. I'd already cut out caffeinated coffee after 6pm and after googling found that decaff can also cause sleep problems in some people. So I cut that out.
I still had the problem.
I'd already realised that very sugary things (which I've always eaten in the evening) made my heart beat faster so maybe that was causing it. Cutting out chocolate, biscuits and any kind of cake was hard but I've managed it for 4 weeks now. It's helped my heartbeat not be so strong and fast after dinner but,
I still had the problem.
Frustrated one day I tried a test. I lay down in evening, 2 hours after my last T3 dose, when my T3 should be high. No heartbeat problem. I had dinner and after it I lay down. No heartbeat problems. A couple of hours later, no heartbeat problems. Then I went to bed and I got some irregular beats. The only thing I'd done between the previous time I'd lain down was I'd had a diet ginger beer. I'd cut out diet coke some time ago (which cured my acid reflux) and knew that this ginger beer didn't contain aspartame but I found it contained sucralose. I looked it up and found this:
Just have a look at the comments on there!
I'd found the problem, it was Sucralose. I cut out all fizzy drinks and I haven't really had a problem since.
I've upped my middle dose by 5mcg then by another 5mcg and feel very much better in the afternoon and evening. My heartbeat is too strong at night if I take my last dose of medication later than 7pm so I avoid that. I still get some anxiety at night because this is when my worries go round in my head. This makes my heartbeat a bit stronger but I don't get irregular beats.
So I wanted to share with you all that if you're taking any kind of thyroid medication and only have irregular heartbeats then it might not be the medication. Before I started thyroid medication I can't remember having irregular heartbeats but I was never looking out for them. Also my pulse was slow and blood pressure was lower, so sucralose would never have raised it high enough to have an effect I suspect.
I hope this information is helpful to someone out there.