Did my flu shot at Walgreens on a Saturday via appt. Waited one hr cuz so many walkins. Felt SOOOO bad for their staff, I think they wanted to tell the walkins appt only but then loss of business where the higher ups would whine.
So weeks later I was due for the 3rd Covid shot, and decided to do the Walmart next door. and its a grocery walmart where there was No one waiting around, I was their only customer that Saturday morning/noon.
While I fell asleep with flu like symptoms on my 2nd shot for couple hrs and then felt better, this 3rd shot caused fatigue/weakness for two evenings. So weird, but guess it proved I had a strong immune system.