Could my night issue be really hurting my heart?

Hey guys...so just when I thought my night issue of waking to to a fast heartbeat/labored breathing was getting better, it's back with a vengeance last night. I have an appointment on the 26th with a pulmonary doctor/probably a sleep study...but i'm just so confused by these symptoms & they really worry me wondering if it's doing something bad to my heart. I don't get it every night..so if it's a sleep apnea type thing..does that come & go? I fell asleep last night around midnight..slept ok (as far as I know) until 3:45am..woke up and initially didn't really feel anything (like no actual pounding in my chest) but felt my pulse and I didn't count but was probably around 85-90 bpm, and I felt like I was breathing faster than normal (not necessarily short of breath..just the sense of breathing fast) took a xanax and fell back to sleep, but kept waking up about every hour after with same symptoms. I don't know how to explain how it feels but I know when i'm gonna have these episodes all night long, because I can feel it in my breathing and heart. Even after laying there and getting my heart to slow down, as soon as I turn over or move it kinda shoots right up and starts over again. Then when I wake up for the morning and get up, this specific issue goes away. Although during the day I do randomly get that breathing feeling..like fast breathing/hard to breathe. Xanax doesn't help it, I take my beta blocker and that doesn't help what happens at night. I have Hashimotos and the one goiter on my thyroid is pretty big..can this be causing it all?! Could this be really hurting my heart? I'm so frustrated and just want to sleep normal again!!!

Hey G-

I'm at a loss and I think that only a doctor can probably give you the answers that you're looking for.

I can say that I have woken up in the middle of the night hundreds of times with that racing heart feeling. For me, I believe it is completely anxiety related. Since starting my zoloft, I've been sleeping much better and I haven't woken up like that in quite awhile.

Hang in there!

Is apnea a possibility? If so, very treatable.

Thank u all so much for taking the time to reply to my post! I know you can't diagnose me but I guess im hoping that someone reads it and goes OMG yes I have the same thing! Haha.
What I can say is the breathing issue I wake up with in the middle of the night, I also get sometimes during the day. Sometimes really bad like all day long...then there's days I domt gave it at all. Its the odd fast heartbeat that I dont understand. Cuz everyother time my heart beats fast I can feel it..during these episodes I dont feel any pounding until I feel my pulse. Sometimes its accompanied by the fast breathing, sometimes not. Sometimes it brings on the skipped heartbeats (which up until a month & a half ago I NEVER got the skipping in the middle of the night) its like it started right before I found out about my thyroid..but the endocrinologist says it wouldnt cause these issues. I definitely feel anxious & shaky once I awake to this..but although xanax might make me tired & put me to sleep..I still awake again with the same issue an hour or so later. Im just so very frustrated!!!

Thanks so much Park!! I'm sure you're all sick of reading me posting about the same issue..but im just so desperate to figure out what it is/if its dangerous to my health. And I will text u after my appointment next week at the pulmonologist & let u know what they say..along with updating on here:)

And SC I appreciate u always being so positive & encouraging!! Thank you for always responding back with helpful tools!