Thank you to everyone for the support. I have seen paramedics todays (they are heroes) who ran a battery of tests and confirmed my vitals are a-ok. They are not allowed to run covid tests anymore (shockingly irresponsible uk gov) so we will never know for sure but they said the symptoms correspond and it's most likely it.
Thankfully I didnt leave home after returning so hopefully have limited the spread.
Please take care of yourselves folks. This is a disease that gets worse each day while you have it.