Left sided chest pain for 12 months? ?

It sounds as if you're doing everything right in terms of getting all the tests you need to ensure it's not your heart. I have heard that some covid patients that had a mild case sometimes get that and doctors don't really know why but covid wasn't really around in late 2019 (well it was not known to be around). The only other thing that might make sense is if you are having some anxiety or are generally an anxious person. From about ages 32-62 you are at the height of "the age of responsibility." Maybe you're caring for kids or elderly parents or even just paying the rent/mortgage. These are the years that you will have the most weight on your shoulders. If there is any possibility of a different job that doesn't involve heavy lifting, that could be an option to see if things improve. But your anxiety that it will never go away could actually also be perpetuating it. I do this thing when I have pain somewhere in which I close my eyes and imagine telling my brain to send oxygen to the area. Then I try to think about if this could be triggered by something emotional. And then with my eyes closed I ask myself is this anger? is this resentment? is this guilt? Is this fear? Is this bitterness? And sometimes when I say the emotion in my head, if the pain either increases or decreases, I know I've hit on something. For me, guilt is the big one so then I will think about all the things I could possibly feel guilty about. And then maybe go through the list of people that are closest to me (including the boss, parents, children, spouse/partner). And again if in saying their names, the pain increases or decreases, you can tell who may be involved in repressed emotions. Those emotions if left unexpressed, can cause physical pain and disease. We don't even realize we're repressing them because we're taught to be good humans and not to complain and to tough things out. The good news is that this works really well on muscular/circulation issues because your body tries to trick you into thinking about your body instead of an unpleasant emotion. Most people if given the choice, would choose to feel the emotion instead of the pain that just brings on more fear. Once I started recognizing that I was not expressing my anger or guilt, I walked around for 2 years in my 30s just angry about everything until I learned to manage it in a healthier way. Our thoughts are things and they will manifest in our bodies as pain. Think about when someone blushes - that's the manifestation of blood circulating to the face because of an emotion - embarrassment. Anyway, try not to let the fear get to you. If a doctor tells you they can't find anything and you have no other symptoms or family history, then you have to think about other reasons. And you have to make the effort to eat healthful foods and ways to ease the stress.

chest pains for 12 months dude? wtf man go see your doctor asap dude and dont leave the hospital Jesus help this man please!

You're describing tendinitis very accurately. Sounds like it was caused by repetitive stress. It can take weeks or months to heal.  Cortisone shots can help if the pain becomes too much. I've had it and it's no picnic, but it did go away.  

Maybe it's related to stress and anxiety.  Your muscles get tense and then sore.  You might even be doing that in your sleep.  Anxiety can mimic heart problems.  Usually anxiety causes shortness of breath, but not always.

I'm only guessing.

Some stretching or some yoga.  There are good you tube videos that can target specific areas.  And some meditation.  And look up "mindfulness".

Listen to music and do something fun.  And drink more water,

I am surprised your doctor didn't send you to a cardiologist to eliminate the possibility of heart problems. That is what mine did.