Walaikumasalaam
Continue reciting surat Fatiha and Aytul Kursi insha Allah this will heal. I know it's difficult to get a doctor's appointment atm but try and get some blood tests done. You may be suffering from anaemia.
Have a look at your diet. Cut out all junk and eat plenty of veg, spinach, fruit, raisins, beetroot etc. iron rich food and eat this with citrus fruit i.e. oranges.
You have to stop eating bread, chappaties etc. As this works against us. I suffer from fatigue every day so i know the struggles!!
May Allah swt heal us Ameen.