Iam not diagnosed but chest pains all day everyday for 3 years are seriously ruining my life

I’ve had many heart tests done when the pain first started 3 years ago I had ct scan, bloods, X-rays, ecgs all cleared. The pain consisted over years I’ve been the er 10+ times and every test concluded is normal my last visit was last month

My pain is central and left sided, when left sided it feels like an ache but when central can feel like an ache or crushing feeling. It’s there all day everyday day, if pressed down the pain is worse in certain spots, if I lay down for a while the pain can decrease but when I move it’s back, sometimes it can be minimal but sometimes very severe. Pain meds do not help.

I have a backpod I’ve been using for a month, I did notice if I do a certain stretch, I put my hands behind my back and hold a towel either end and lean back if I do that sometimes my chest cracks and then the pain feels released for a little bit?

Drs keep telling me it’s anxiety or muscular but will not do anything else for me at all, I’ve had this constant for 3 years now and it’s killing me off I can not enjoy life.

I’ve tried heat, stretches, ibuprofen, paracetamol, co codomol , naproxen and they do not help.

I do also take meds for acid reflux but my gp said it won’t be that

Edit - currently on amitriptyline 20mg to see if that helps

Any advice please?