I hate the alarmist attitudes uninformed medical professionals have toward thyroid replacement meds. It's also sometimes used as a "tactic" to bully the thyroid patient into accepting less than optimal level of thyroid replacement meds unfortunately.

First, "going hyper" is usually something that happens to people with HYPER thyroidism aka Grave's disease. And, it is dangerous if that happens because there's no way to slow it down by oneself - medical treatment is necessary.

However, for the typical hypothyroid patient "going hyper" is something that doesn't normally happen unless it's chemically induced (aka replacement hormones) and just as you described...back off the meds. (Big duh, right?) The ER is totally NOT necessary unless of course someone takes an overdose of medication by mistake (like swallowing 10X the meds you'd normally take).

So, you were right to trust your instincts on this one. Your HCP is looking strictly at your TSH. Which, she/he should know is artificially lowered by armour (it's on the rx'ing info). The higher T3/T4 ratio in armour lowers TSH but not to worry unless your Free T4/Free T3 is sky high.

And, yours isn't too high:
Your free T4 is sitting at 48.42% of range - so you have a long way to go before "optimal"
Your Free T3 is sitting at 70% of range so you still have wiggle room there as well.

A 15 mg increase (less than 1/2 grain) isn't going to send you into hyperland. Your HCP may simply be practicing CYA (cover your a**).

I remember swinging Hyper in Fall of 2013. As bad as 'hypo' is I felt even worse being 'hyper'. I avoided going into the ER because I know from experience they're clueless pretty much about thyroid and only test "TSH" and "Total T4". I personally handled my situation by cutting my dose in half for 2 days, then raised it up but less than what it initially was. I dealt with 'hyper' symptoms for about 6 days and felt pretty horrid but it did clear and go away. Of course I'd always advise if you feel the need for medical help do seek it. It does take time for the excess thyroid hormone to clear. This goes for Hashi patients to who can experience a 'dump' of excess thyroid hormone into their system.

I was a little hyper here recently. Was having TMJ very bad, running to pee all hours of the night, anxiety, hungry, swollen body, hand tremors occasionally.

Now all those symptoms are gone after lowering my dose. That's just some of the symptoms to watch out for.

It also depends on what we eat, how much we eat. This can cause different thyroid results.

And racing heart - that one always freaked me out the ONE time I was given too much thyroid medication. My doc made the mistake of giving me 100 mcg to start with (it was an endo). That's waaaay to much to start with! LOL

I must say pumpkin..you do have an informed doc, even if over cautious.
My doc lowered my dose of armour as my TSH was 0.14 even though my FT3 was 3.1, & my FT4 0.9 ?!! Citing the old worn out "brittle bones" excuse..So at least she doesn't see a zero as the first TSH number..and cut back like so many docs..
MB is right..your body will tell you if you are taking too much.