Hello no more panic, I'm looking to see if anyone is experiencing or has experienced anything similar to what I'm going through at the moment

I'm currently going through a bad patch of anxiety. Around 7 weeks ago I started getting what feels like palpitations in my chest, these would last a few seconds then go away again. I was switching medication from Fluoxetine & Quetiapine over to Sertraline to reduce the overall number of tablets I was taking. I also take Esomeprazole and Propranolol for reference. Due to the change in my medication I assumed that these palpitations may be normal.

A week or so after they started the vibration/fluttering became more intense and would last much longer before disappearing, in my worst episodes it feels like my whole chest is vibrating/shaking. I monitor my obs the best I can at home during these and my pulse is never higher than 75bpm and my Blood pressure is also usually around 120/75 which are both good, generally my resting heart rate would be around 60-65 but as I was experiencing all this I have put it down to stress/anxiety raising my heart rate slightly - important to note that 75 is still a perfectly fine heart rate (I'm a 32 y/o male)

Eventually my anxiety wins and I take a trip to the emergency department one evening, my stats were slightly raised but not by much. Most importantly they performed an ECG on me while I was actually having these strange sensations, the ECG came back clear. Very quickly these sensations subsided and almost vanished for around a week until they came back again.

At the moment I've had 4 weeks straight of these sensations, the episodes are now lasting hours instead of minutes, aside from the panic and feeling rubbish from worrying about the sensations I hadn't had any other side effects until today. I have had two GP visits and all general observations and examinations during these have been fine.

The working theory is that Sertraline hasn't been working for me at all (i'm up to 150mg per day) and my bodily sensations are all due to the stress and anxiety generated around essentially being unmedicated. The plan is to switch my medication back to one that has worked reliably in the past to stabilize my anxiety. I don't 100% believe that this is anxiety that's happening but I do also have a lot of evidence to suggest that it isn't anything heart related. Has anyone else experienced anything similar?