Sinus bradycardia means that your heart rate is slower than that of an average person.

Since having hypothyroidism means that all body systems are slowed down, proper treatment of your hypothyroidism *might* help your heart rate issue.

I hope you're able to get your doctor to keep adjusting your dose until your thyroid hormone levels are similar to those of a healthy person: FreeT4 near the high end of the range and FreeT3 around 75% of range (half-way between mid-range and the high end of the range)

Why, yes...yes I do.

I could list alot of medical journal mumbo-jumbo but I'm going to try to explain this as simply as I can:

Thing of your nervous system as the conductor for electricity (or the means by which life actually flows). Got that? Good.

Thyroid hormones affect literally EVERY cell in your body. Every. Single. Cell. Your cells cannot function without the right amount of thyroid hormone. It cannot be done. This includes your nervous system (we're going to focus on that system right now because that's what lies at the crux of your question).

So...nervous system does not get enough thyroid hormones (hypothyroidism)...nervous system freaks out - it's like having an uncontrollable sputtering current flowing through your home - breakers blow out (arrythmia, bracychardia, vaso-dialation, eye-sight can change, diarrhea/constipation, and the list goes on) , the lights flicker (your brain, your sympathetic and parasympathetic nervous system which controls everything in your body - unintentional systems like your heart - and intentional systems like your muscles), certain household items are burned out if this problem continues long enough or at an increases intensity (organs, cells, or systems are damaged or cease to function).

Once your cells become saturated with ENOUGH thyroid hormone - your nervous system (the current in the house) begins to flow as it should - meaning all the house-hold appliances (organs, cells, systems) function as they should - this includes your heart, your pancreas, and all the other organs you normally would pay no heed to.

So, bottom line is, your prediabetes will most likely disappear with proper thyroid treament and a proper diet. And, your brachychardia will possibly disappear with proper thyroid treament.

And...when I say "proper" I mean levels of Free T3 and Free T4 that will allow you to function optimally.

Wow!
Thanks for that explanation.
Am advised to re check my thyroid again , which I will thou did it about 4 weeks ago.
Am also struggling with high cholesterol , so am on meds for that, despite loosing 9kgs, am almost at expected BMI.
Doctor said I could have costochondritis, and that's what she is treating me for currently as we observe.

If you are taking a statin be careful because it can effect your thyroid hormones(some doctors are clueless.

One time I was quite hypo and they put me on lipitor. It caused me to have severe muscle pain where I could barely walk. My feet were so much pain and lead me to tears. So they took me off of it.

High cholesterol is very common in undertreated and untreated hypothyroidism. When your thyroid levels become normal for you Ft4 and Ft3, then your cholesterol should go down.

I told my NP that I was unable to tolerate statins. She did not say a word. Actually they should give you a menu on low cholesterol diets. Only had one doctor that told me to try diet first.

They do like to dish out prescriptions because they get kickbacks from the companies.

Hmm sometimes I get the slow heartbeat, likes to inch into the 50s. Then again, sometimes mine goes too fast , so I'm not much help :)

If it's just too slow, I'd definitely make sure you are optimal on the thyroid meds first, b/c that slows everything down

There is also a new theory that stress levels can slow your heart rate.
Been going through quite a lot , but I didn't think it would lead to this .
So between the hypo and the stress am not sure which is the cause .

There is a DIRECT connection to hyperlipidemia (high cholesterol) and low thyroid (hypothyroidism).

Your cholesterol levels will drop as your thyroid levels increase.