I was going to say anxiety too. Watching my own DD struggling with panic attacks recently and I can totally see where his symptoms could be related to his anxiety. I am also aware of the microclots some people have experienced. The one person IRL I know who developed microclots throughout both legs (groin to ankle) didn't develop them immediately during the acute phase of illness but as a long covid reaction. She's now 2yrs out from that covid infection and is having surgery to have the clots removed. She had to first take medication to help break them down a bit more. They are surface level clots, like tiny pebbles under her skin, and not a risk of DVT or a clot coming loose and traveling to her heart/lungs/brain.
ETA: my SIL had COVID last week. Started with sore throat and congestion, tested pos, and then next day was so ill with vomiting that she couldn't keep water down. Went to the ER for fluids and an antinausea med. We were all surprised with the vomiting as all the news reports of this current strain seems to say it's very mild cold symptoms.
Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.