@godfather2- Welcome to Mayo Clinic Connect. So many terms to be learned involving the lungs! When I first had lung cancer medical terms were daunting. I don't know why the medical field makes it so difficult to understand what is going on.
Sub centimeter means less than a centimeter (less than .5 inches.) So it's very small. Waiting 6 months indicates that your doctor doesn't think that there will be a lot of changes to see within a 6 month period, so if it's going to grow at all it will be very slow. This is very good.

I imagine that you were having difficulties with breathing and sought help. Had you had any lung problems prior to Covid-19? Also when you have a chance to be vaccinated jump at it. People are finding that it helps with any long-term covid effects.

Ground-glass opacities are abnormal findings on a CT scan of the lungs. They are hazy areas that do not obscure the underlying structures of the lung, such as the bronchial airways and blood vessels. They are found in people with various lung conditions and have been seen in people with COVID-19.

Raynaud's disease causes some areas of your body — such as your fingers and toes — to feel numb and cold in response to cold temperatures or stress. In Raynaud's disease, smaller arteries that supply blood to your skin become narrow, limiting blood flow to affected areas (vasospasm).
https://www.mayoclinic.org/diseases-conditions/raynauds-disease/symptoms-causes/syc-20363571
https://www.mayoclinic.org/diseases-conditions/raynauds-disease/diagnosis-treatment/drc-20363572
I am going to ask @johnbishop to help here. He is a fellow mentor and will know more about Raynaud's phenomenon.

Have you asked your doctor any of these questions?

@godfather2 - I would like to add my welcome to Connect along with @merpreb and others. I did find some information that hopefully may help put your mind at ease. Hopefully other members can share their experience with subcentimeter GGOs.

- Management of Ground Glass and Subsolid Pulmonary Nodules: Review: https://pulmccm.org/review-articles/management-ground-glass-subsolid-pulmonary-nodules-review/

You may want to join in and post any questions you might have in the following discussion on Raynaud's Syndrome - https://connect.mayoclinic.org/discussion/raynauds-syndrome/. Here is some more information on Raynaud's:
- Raynaud's phenomenon: https://www.nhsinform.scot/illnesses-and-conditions/heart-and-blood-vessels/conditions/raynauds-phenomenon

@godfather2 This is a good time to start looking at a medical grade genetic screening. The ground glass is early Cancer, and CAN be a sign of various autoimmune cancers. Nebular Genetics is one of the better DNA screeners, I hear. My ground glass turned out to be Gelsolin (GSN AKA AGel, Finnish Gelsolin). Another fellow here has a different cancer, but the first real sign was the ground glass.