Anxiety can be really bad news for your body, absolutely. It can cause all sorts of physical symptoms in and of itself so it is far more likely that is the cause of your symptoms than long covid. I'm not surprised you're terrified, it sounds utterly overwhelming, but equally it's crucial you find ways to calm yourself down so your body can rest properly and heal. The body is really incredible at healing all sorts when you allow that process to happen. You are very unlikely to have long term problems from this virus - the vast majority of people don't and many long covid sufferers have found their symptoms still ease with time. The more you wind yourself up (I mean that kindly, that's what we all do when we're anxious), the more things will spiral including physical symptoms.
I think the number one thing is find ways of helping yourself practically for now - supermarket deliveries, ready meals, anyone who can help look after your baby for a bit here and there. Prioritise rest and essential care and if you catch yourself worrying about things days ahead, be strict with yourself. That will sort itself out, just think about now. You also actively need to be doing some mindfulness or really basic gentle yoga to calm things down more. There is so much help online with anxiety - try TikTok or Youtube videos for some tips. Nicole Sachs does an amazing anxiety course which really helped me.
Just for today - every time you find yourself panicking you need to stop and check in with the present moment. Where are you? What can you feel? What is the weather doing? Can you slow your breathing. If you can breathe in for 4, hold for 4 and breathe out for 4, that will help a bit. Everything else - the panic about the future and the what ifs, you need to be strict and say 'I'll worry about that another time. I will be able to sort anything that comes up when it happens.' Keep repeating it even if you don't believe it.
You've had a lot thrown at you but you can do this. It's absolutely brilliant to be asking for help from the GP, the medication will hopefully help too. You keep going. You're doing brilliantly. 