Welcome to the forum. I am sorry no one saw your previous post and I'm very glad you came back.
Sadly there are many people who have panic attacks, me included. It's quite a scary thing to experience. Because of the chest discomfort many people think they are having a heart attack which tends to make the feeling worse. Then they call an ambulance go off to hospital, get checked out and sent home. I know this has happened to me a couple of times and I have felt quite silly afterwards. It shows how bad it can be.
You are doing the right thing with meditation and music, both soothing activities. Having nothing obvious to be stressed about does not stop us having panic attacks. Being in quarantine may feel you are coping OK but I suspect it's not that comfortable. Not being able to get out to do the activities you enjoy probably is a stressor for you even though it may not be obvious.
I have not had a panic attack for years but started having them again about a month ago. I was so surprised I did not recognise it at first. Then I was cranky with myself for feeling that way and like you I could not see what could be causing it. For me it was a combination of events. COVID isolation, being triggered to remember a very unpleasant event from five years ago that I thought I finally consigned to the rubbish bin, not seeing my family because of isolation. Perhaps there are a few things like this in your life.
Like many other mental health difficulties there is not always an obvious reason. Or the reason is not recognising what is happening in my life. These things have a habit of popping up to upset us. I have found I need to be totally absorbed by something to make the attack go away. Fortunately for me I have a couple of hobbies where I can escape.
I have also talked about it with my GP who suggested she increase my antidepressant meds. I am not a fan of meds but I realised I did need some help so I agreed and the dose was increased. It did help a great deal. While I still had a panic attack it has been infrequent and more easy to manage.
I was so involved with the panic that I could not decide what to do. I made a list of activities that would take me away from the panic and kept this list on my fridge for quick access. It made a big difference.
I do suggest you see your GP as well as find activities to do. Taking meds for a short time may help or your GP may have some other suggestions for you. I hope that helps. Please continue to post here.