@Dave7 Try not to worry too much about it with everything else going off it's not surprising. The mind can do funny things when it's working flat out. If you can try and keep a note of when it happens and what went off that day. To see if it's linked to anything.
It may well be linked to your long covid still a lot we don't know. A blood test is the best route and really the only route to rule out the low hormone , vitamin or combo of them. Maybe worth having your thyroid function tested at the same time.
As you've got to go back to the GP after you've finished the vitamin D course. I'd tell them then as you will be having your bloods done anyway so it's easy to add extra tests to the blood form.
It may well be linked to your long covid still a lot we don't know. A blood test is the best route and really the only route to rule out the low hormone , vitamin or combo of them. Maybe worth having your thyroid function tested at the same time.
As you've got to go back to the GP after you've finished the vitamin D course. I'd tell them then as you will be having your bloods done anyway so it's easy to add extra tests to the blood form.